Hi there ~
I understand your concerns. Using or abusing meth can have a lot of side effects and your having lightheadedness
with some fainting episodes is quite common when you are using. I believe that you are a good candidate for psychiatric rehabilitation
and you should consult a psychiatrist
who is good in substance use disorders to be able to help you overcome your dependence on meth.
I hope this helps. Take care and have a lovely day!