I know what you mean about the depersonalization, I hate it when that happens, it usually lasts a few days after I smoke too much, combined with me feeling nervous about something. I just feel 'not right', sometimes I'll stare at something boring and i have to look twice to make sure i didnt imagine it or if I'm dreaming, that goes away after a long while though. Since you're a newbie, I'd give that at least 7 days of sobriety to go away.

I'm not really sure how they test if you're allergic to weed, but if you have any left, take the biggest lump of it, and rub it on your shoulder, enough that some of the oil rubs off. If it ever irritates, becomes a rash, or anything out of the ordinary (if you're not allergic, absolutely nothing will happen) within the next day or so, you're allergic.