I've always been a coffee drinker, but for Xmas I got multiple coffee machines which can make very strong coffee and I've been drinking a few of these a day. I'm on Sertraline and it's helped my anxiety SO much. Recently I've started to feel anxious over nothing again. Paranoid everyone hates me. Worried about something, but don't know what it is, feeling a bit down etc. The only thing I have changed is my increase in coffee.
This may seem weird, but it's the only thing I can think of.