Tolerence to Amphetamine and possibly Cocaine also

[paau]

So the story is; last year swim used to do speed a bit. Maybe get through 1-2 grams a week. This carried on for about 6 months and towards the end (possibly the reason swim stopped doing it) swim felt very little effect from it.
So swim was like, ok fine i'll give it a break. And swim left it for about 6 months and did a couple bombs one night and felt barely anything. Swim tried taking more and more but had absolutley no effect.
Then swim tried coke a couple of weeks ago and was extremely unimpressed. Whilst everyone else seemed to quite enjoy it.
Swim is worried that something has happened whereby swim cannot 'come up' on speed or coke.
Is there anything swim can do about this?? Swim really misses it!