Week 4 dip?

Hi everyone I’ve been on Sertraline for 32 days now, I wasn’t leaving the house, I was bed bound because of my health anxiety. I had a really rubbish week 1, week 2 improved slightly was able to go out a bit more, week 3, went food shopping, walking to the shop daily, being able to not be scared about being alone and now I’ve hit week 4, I feel panicked again? I hadn’t googled for 2 weeks then turned to Google and bam I’m anxious. It’s so deflating because I was doing so well :( has anyone else experienced a rubbish week 4 dip with side effects back slightly. If so any advice? Thank you 🤍