I have suffered from GSA for decades- most of my adult life.
I keep it under control mostly, it does raise its head when challenges or
difficult change happens, but I have developed strategies to manage my anxiety and keep it under control.
We are all different of course, so what works for some people may not work for others.
I find a combination of things most effective, stacking everything up, not just one technique or method.
I have tried medication, but prefer to keep things under control without drugs.
I think for all of us making sure we get enough sleep and a decent diet is crucial.
Alcohol makes me much worse for a day or two afterwards, so I avoid totally if I am going through a bad patch.
Rumination and "hamster wheeling" thought patterns are really challenging to cope with, CBT is a useful thing to learn, even if you only use some elements or use it at some points. It is useful to learn about the connections between thoughts/feelings/activity for instance.
I practice daily yoga which has been a life saver, really helps to focus and centre the monkey mind. Most physical activity- gym, walking, swimming will again drain the system of the nervous energy, use up the adrenalin and produce good feel hormones in the brain.
As does meditation, there are some great anxiety reducing videos on you tube, I have a few favourites that are only 5 or 10 minutes long that I turn to when things become uncomfortable.
I like to listen to anxiety reducing sounds or music on youtube too , I will have it playing in the background, my favourite is female chanting at the moment.
Get outside into the garden- earthing( barefoot walking even on the back lawn) can ease and ground anxious feelings. A walk in the woods or some natural environment, a flowing river is also very soothing.
Try to cultivate a creative activity, whether painting, mindful colouring books, or singing tasks which are easy and repetitive like knitting, sewing or a craft is helpful. The repetitious nature of an activity is almost mantra like and is very soothing.
Most of all be kind to yourself. Imagine how you would treat a good friend who was feeing anxious. A scented candle, cosy throw -or weighted blanket for sleep, and a good selection of herbal teas are comforting. I drink a lot of Chamomile, Peppermint, most supermarkets have lovely blends of calming tea bags. Twinings and Pukka are good.
Keep calming images or figures where you can pass them daily, or some words of wisdom that give you calm- you can stick on the fridge door. I have salt lamps, Buddha statues, pictues of trees and waterfalls around, constant visual reminders of calm as I walk around the house.
Do speak to your GP- there may be some local initiatives, but in many places the NHS is so stretched that counselling is almost impossible to access.
There may be other routes though- I am a carer, and can obtain counselling free through a local charity , so find out what is available in your area.
Don't give up hope. Anxiety can be very hard to deal with but also managed sucessfully if you find te right tools that work for you.