Its true - things take time to resolve, and lots of effort. You are putting in the effort and taking the positive steps needed, good on you!
However, don't think that everything will just disappear into a poof of smoke and a ever present oasis of fear-less happiness LOL The feelings and thoughts, and ways of responding to situations (particularly bodily symptoms in your case) have been learnt and engrained for a long time. It will take a long time to reverse the process as your brain has been trained a certain way, with certain responses to triggers.
This isn't a step backwards, when blips occur, as you now have a good set of skills to deal with the new symptoms more quickly! The fact that some ALS 'symptoms' went, mean that now you know things will go once you work on it, and these symptoms will disappear too in time.
Keep going, keep plugging away and in time the dividends will be paid. HA fears will become less frequent, and when they do occur you will have learnt new ways to squash them.