My psychiatrist diagnosed it as unipolar sever agitated depression. But bipolar could not be excluded. I wonder if it’s because I have only ever experienced the down episodes.

This is what happened to me. Anyone has any advice or experienced anything similar?

Four months ago, I got some stomach bug that then triggered anxiety, insomnia and quite severe agitation (I was convinced I was going to die). It got so severe, I started experiencing dp/dr and many other strange symptoms (I thought maybe I had long covid; still not certain).
I felt I couldn’t experience/perceive things the same way again and it’s as if parts of my brain stopped working. I lost interest in everything and was only obsessively trying to find what was (physically) wrong with me. After many tests (all normal), I went to see a psychiatrist.

I was put on clonazepam 0.5mg for sleep (and up to another 0.5mg during the day) and then Lexapro a week later. 
Clonazepam made me sleep instantly. But the whole thing turned into a kind of agitated depression; I still didn’t feel like myself, even though clonazepam removed (or masked) many physical symptoms.

I am now slowly withdrawing clonazepam and noticing that the original symptoms are coming back. I’m concerned Lexapro may not be doing anything (how would I know; while on both medications). I have been on Lexapro now around 6 weeks (10 then 15 mg). And I worry I will end up worse off than before starting clonazepam. I’m now at half the dosage for clonazepam (no more than 0.5mg a day) and I wake up at 3-4am again and the restlessness/agitation is getting bad again.
Although I also had good weeks but cannot be sure whether it was due to Lexapro or the benzo. (I worry it’s the latter).

Has Lexapro helped anyone out in a similar situation? (Or has anyone been in a similar situation?) I find my situation is quite unique because of the physical nature of the symptoms. Nothing really happened in my life; the trigger was just some food or a bug and caused 4 months of hell, with no end in sight. Everyone is telling me that I will get better eventually but I cannot possibly believe this. Nothing has changed much and all it got me so far is a benzo addiction. This is the hardest thing I ever had to go through in my life and I can’t see a good ending to this.