Are you taking medication for your fibrymialgia? We are very similar. Although I am not diagnosed Asperger's, I have struggled with oversensitivity my entire life. It began in 4th/5th grade and ever since, its only gotten worse. I cannot look many people in the eyes. I cannot enjoy a dinner with my family. I cannot stop thinking about how I feel, every little movement of my body gets scrutinized, from a leg twitch to a one sided crack of a smile. I'm over-sensitive to social cues & it causes extreme social anxiety. Nicotine vapor can/does give me anxiety, but I know when to quit vaping before that happens, usually.
As far as nicotine juice goes, I notice the effects of vaping in conjunction with my medication almost immediately. If you are on pain medication for your fibro, I believe that cigarette smoke potentiates the euphoric side of pain medications, where-as, our e-cigarettes actually cause dysphoria. Vapor does little to nothing in the way of potentiation, because it lacks MAOI activity. Our nicotine also makes friends/family of mine living on pain medications often feel very ill, nauseous, and foggy-headed if they've skipped a regular dose, or if they've taken a dose too soon after the last. The pure nicotine acts as a dopaminergic receptor & dopamine catalyst. Which can cause symptoms of over-sensitization, classic "withdrawal" syndrome, classic nicotine overdose symptom, and dopamine overstimulation. So our e-cigarettes can be tricky to get the hang of for those on these types of medications.
I think you would truly benefit from purchasing a small 15ml bottle of whole tobacco alkaloid juice. It does contain MAO Inhibitors, which means the WTA juices DO allow for more relaxing feelings, more-similar to cigarettes, in comparison to the solely nicotine molecular makeup in regular e-juice. & nicotine pretty much only acts as a stimulant, never a high dose stimulant. (unless it is potentiated by MAOIs) The difference between low & high doses of nicotine is night and day. In low doses, it is strictly a stimulant. In higher doses, it's a stimulant based sedative. Which means you're body will feel fresh, renewed, but you won't get undesirable effects, such as overactive mind or physical hyperactivity or over-firing neurons. Rather, with WTA juice, it gives the effects of focus, calm- stillness of mind, and all of the effects we were used to with cigarettes, such as potentiation of other substances, and "relaxation" of the body.
What you SHOULDN'T do, is you should NOT listen to people telling you it is nicotine withdrawal. Nicotine withdrawal and nicotine overstimulation feel almost EXACTLY the same. So it's very easy for one to steer another wrong, if they do not know the other's whole-story. If you were a regular smoker of 1 or more packs per day, I recommend going with 12 to 18mg juice, no higher. You may be able to get away with 10-11mg but no higher than 18 and no lower than 10 without experiencing uncomfortable symptoms.
In my opinion, 24mg juice is SOLELY for reducing the amount of "puffs" one has to take to get a sufficient amount of nicotine per vape. 24mg in my opinion, should never be vaped like we used to smoke, if you were a heavy smoker. (people like to think [naturally] that it would make sense for a heavy smoker to use a HIGHER mg amount. On the contrary, I believe that a heavy smoker should use a LOWER nicotine amount, because a heavy smoker will be a heavy vaper) Using 24+mg nicotine liquid will potentially only cause immediate problems of over-stimulation, and eventually, a leveling out, a new baseline, and ultimately a higher physical/emotional dependance than the dependance one had before switching from cigarettes to 24+mg juice. Could a 5 a day smoker utilize 24mg juice? I think so. They could drastically reduce the amount of puffs they need to take for those 5 vapes each day. One to four puffs from 24mg juice should sufficiently satisfy a 5-10 a day smoker. But if your going to chain vape like you chain smoked, then 12-18mg will replicate the experience of smoking much more efficiently, in my humble O.
Thats all I've got. If this post gets scrolled over like I suspect the others have, then your all on your own.