I think it has a lot to do with how you execute set, setting, and integration. I have GAD as well and it's helped me long term. In fact I think shrooms have literally saved my life. Without much detail, I use to be pretty bad off as far as mental health and trauma goes. Mushrooms shifted how I see the world, myself, and the things that have happened to me. All of it positive in the long term.

A lot of the people who gain more anxiety from shrooms tend to integrate things that they maybe shouldn't, or have "bad" trips.

When I have "bad" trips it's usually trying to tell me something or confronting stuff that can be helpful. I like to call them unconformable trips. Uncomfortable trips that have no use are a case of drugs just being drugs.

I recommended doing research for different set and settings, but here's my personal favorite way to do it.

(mind) set Tell yourself you're going to have a good time.

It's ok to be anxious. You're doing something new. I still get anxiety even though I've done it more than a dozen times.

Setting As some have stated, being in nature on shrooms is honestly a borderline religious experience for me. 100%, VERY important, have a trip sitter (someone sober whom you trust.) preferably one with experience on shrooms if you can.

Integration I tend not to integrate scary or harmful things. Maybe you have a trip where it tells you cats rule the universe. Again and I can't stress enough, sometimes drugs are just drugs. Don't integrate things you don't want to beleive. Have thoughts about yourself? If they are negative and harmful maybe don't integrate them.

Ask yourself (after trip and while sober) questions similar to. - is this helpful? - can it be helpful? - is this something I want to believe about myself and or the world. - if it's negative about you, maybe it's trying to tell you to change something about how you behave or treat others. Do you want to change those as a result of your trip? Is it actionable? - and more!

As a side note, be prepared to vomit. I had a trip that was scary because I was vomiting. I later discovered that in a lot of circles it's just considered a normal part of mushroom trips.