extreme dissociation

hi everyone, i got put on wellbutrin 6 weeks ago. i started on 150mg and things were going great, but because i still had a few bouts of depression here and there my psychiatrist decided to up my dosage to 300mg a week ago. ever since i dissociate heavily at least 5 times a day. i genuinely feel fear every time it happens and its worse around other people so ive been avoiding everyone in my life. i cry a lot and all the motivation i had when i first started this medication is gone. im getting THE worst brain fog. i called my psychiatrist and he told me that the derealisation im experiencing is an anxiety symptom and we shouldnt give up on the 300mg dose yet. he told me to take one 150mg pill and then continue with the 300mg pills. i took the lower dose today and tomorrow i have to keep taking 300mg and im terrified. i really do NOT want to but obviously my psychiatrist knows more about this subject, and i assume he knows what hes doing. has this happened to anyone else? i know ive only been on 300mg for a week and things might get better but im genuinely afraid, my brain goes into fight or flight so often and its messing me up. has anyone else had a difficult experience w/ the 150mg jump?

im sorry if this post is hard to read, english is not my first language and clearly my mind is not at peak functionality lol