Depression from Treatment

I was diagnosed with Graves last week. Before my doctor suspected I had hyperthyroidism in January, I spent the majority of December in a downward spiral of Extreme anxiety, panic attacks, sleep disorders and crippling depression. I was prescribed Lexapro which I had a bad reaction to and had to stop taking in February.

It took 6 months to see my endo and from therapy and lifestyle changes I managed to significantly bring down the anxiety and my depression pretty much went away.

I started Methimazole this week, and it's thrown me into a deep state of depression the last couple of days . Has anyone experienced this? I want to keep taking it since I think it will help me but I also can't take the Lexapro again. Feeling pretty lost in all of it.