Shelley, I am so sorry. You have sure been at this a long, long time. I am not familiar with meth psychosis but I am familiar with mental illness and homelessness . My brother is a paranoid schizophrenic who spent years on the streets of L.A. until we got him on medication and SSI. My sister is bi-polar and my daughter has some disorder, just not diagnosed. My father was bi-polar as well. It's all exhausting, terrifying, sorrowful and agonizing.
I'm responding to your post title, anxiety. I also know about anxiety. Anxiety created by my family's dramatic disorders. Given your story, you may already be aware of all of this....but if you aren't, here are some things that helped me with that anxiety.
Therapy and group therapy for sure.
Acupuncture, it is a miracle for getting ones whole system back in balance, back in a restful peace so that we can use our own system to heal. I'm convinced it's saved me.
Meditation-you can also go on YOUTUBE and find guided meditations by Deepak Chopra, the Honest guys, or just do a search under anxiety and you'll get many hits.
You can look for meditations or music with binaural beats which impact our brains and help calm us down. All on YOUTUBE.
Exercise: just an 11 minute walk changes brain chemistry. Longer is better, but 11 will shift the brain.
Diet: minimize sugar and caffeine.
Supplements:A good quality Omega -3 Fish Oil, I take 1000mg per day, Data shows that along with exercise it can have the same result as antidepressants for mild depression.
Pure organic Ashwagandha. It is used in other cultures for anxiety, it supports the nervous system. Mine is with black pepper extract
Jarrow Inositol powder- also for anxiety
You can google any of the supplements and make your own choices.
Hang in there Shelley. This is hard. Continue posting. Get yourself as much support as you can, you deserve it.