Good for you for doing something positive about your health if your meth use was making your worried.
I had a meth problem myself years ago, I know what it can be like. I almost ended up homeless and did end up in serious debt from abusing it.
I have a good mate who just quit two weeks ago. He had been using on and off for at least the last 17 years. Smoked it. I'm currently trying to help him get through it.
You have to really want to stop using and you have to be really stubborn about it. Just keep pressing ahead, working towards your end goal.
Get good sleep. Eat healthy food. Exercise if you can, even if just going for walks.
Not sure if you're feeling like you're in a position where you can wander around town aimlessly or not, but light exercise will be very beneficial.
Also, what I found helpful was trying to reconnect with things that I thoroughly enjoyed before meth and then making a very concerted effort to get back into those hobbies or sport, or whatever it may have been.
Maybe
@LadyAlkaline can help....she recently celebrated 5 years free of meth.
It's good that you have a good friend you can lean on. That's possibly the most important thing in recovery, I think. I don't know where I would have been without my friends.