I dual used for years before finally getting to the point where I was so physically ill I really gave vaping a shot, and it was super tough in the beginning and I certainly had days where I fell off the wagon catastrophically. It was not good but I'd just pick myself up dust myself off, and resume. I really wanted and NEEDED to quit and that helped.
Right after a year vaping only I started smoking again, mainly from stress but also I had lowered my nic some (inadvertently and long boring story) and it was really really difficult.
I followed the advice given on this forum and UPPED my nic in some setups . It made a huge difference for me, and I will ALSO say, if you are going to up your nic, MAKE IT COUNT. Save those setups for when you are truly having urges and vape them and DO NOT STOP until the urge goes away, (which for me, was probably about 2 minutes from the place where vape sickness sets in.
You also have the option of WTA (whole tobacco alkaloids) if you have not heard about them, but they are substances in tobacco that provide the feelings of satiety, well being, anti-depression and anti anxiety,. The gold standard is Aroma Eliquids, they are pricey but well worth it. I used them in the throes of quitting and they helped me with that "I want to chew an arm off my own or someone else's," sensation that I got every day with nicotine alone. They are far less harmful than smoking since there is no combustion involved. Umbavape and Ohm's liquids also sell them, I consider them to be less potent but to still have some efficacy and the price point can be a bit easier to swallow. Although for early quitting, I would recommend Aroma. Some folks transition off, some save them for stressful situations, some folks vape them in an ongoing way.
You can do a search there are lots of threads if you want to learn more.
Finally, I so understand that "loosing the battle, loosing motivation, losing momentum thing!" It was harder (probably) the second time around for me even though I was smoking FAR far less, because I felt like, "I have already given this ALL I HAVE, and in a moment of stress, smoked."
Don't talk to yourself that way, the members of ECF did not talk to me that way when I relapsed, they were kind, thoughtful and encouraging. You can become smoke free if you choose to! You can find ways to delay distract and to lose those cigarettes one by one, when I finally "Quit" again, I was probably smoking a cigarette once every three days, but amazingly enough that seemed to be what I needed for a bit before returning to smoke free.. And I was saying, "Okay a cigarette every three days is BETTER than three packs a day."
The other thing I did was kill off that first cigarette of the day, my hardest. I knew if I didn't I would be smoking the rest of the day, so I waited. 20 minutes the first day, 30 minutes the second, etc. I knew my love affair with cigarettes was LENGTHY so I ALSO knew that well, my exit from smoking was going to be lengthy as well.
You didn't lose the war, you are not yet dead, diagnosed with cancer, etc., etc. so just ready yourself for the next battle. Every Last cigarette you do not smoke helps your health, even if you don't get to zero right away, but you ARE heading in the right direction so KEEP moving. You don't even have to "Figure it all out," you just need to KEEP GOING above all and try things until they "work".
All the luck in the world to you,
Anna