Hi and welcome to ECF. My sincere condolences to you in regards to losing your friend.
Some vapers have reported that VG affects their lungs with a heaviness or tightness. Good to see you went to your Dr. Some have also reported a sensitivity to PG.
Feeling drowsiness or having bouts of insomnia in the first 2-3 weeks is normal. Anxiety is also sometimes a reaction. Realize also you just lost an acquaintance so I would imagine you're under a lot of stress.
"Feeling tired while quitting is a natural reaction to the withdrawal of nicotine. Nicotine boosts your metabolism to a higher level than is reached in a normal state. As a result of the lack of nicotine, your body will have to adjust by lowering your metabolism. This will reduce your energy level to below what you are used to, but it is also a temporary effect. Soon your body will adjust, metabolism levels will even out and stay steady, and you will become accustomed to the new level of energy."
For some nicotine is a stimulant while for others it's a relaxant. Vaping nicotine is a far less efficient nicotine delivery system than smoking because the vapor particles are too large to enter the bloodstream via the lungs. Most vaped nicotine is absorbed in the mouth and nasal areas. Usually nicotine persists in the body for 2-4 days BUT there are also the other very addictive chems from tobacco that can take up to 2-3 weeks to be fully flushed from the body.
Take heart in knowing your Dr. gave you a clean bill of health and you are now on the path to a healthier lifestyle..Knowing that one day you will be walking your daughter down the aisle is something well worth fighting for IMHO.
Wishing You the Very Best of Luck