I've had similar experience. I found that I went through a kind of mourning for my old life for a while. It's a huge adjustment.

It also eats up a huge amount of time - reading labels for hidden ingredients, trying to come up with a meal that you can make that doesn't include the bad things etc. It became very isolating. Eventually I decided I had to figure out a middle ground.

I will meet people for "lunch" and just have coffee, or whatever I can tolerate from the menu. I have people over more often because I know what I cook won't make me sick. I went back to eating out - it takes a while to figure out/trust restaurants you can eat at. There will be mistakes along the way.

Good luck - I hope it gets easier for you.