If you explain your situation/symptoms to the Cannabis Club, they will no doubt be able to offer you a better strain more suited to your unique condition. Don't be afraid to discuss this with them! The people know what they're talking about.

Otherwise I'd say the best thing you can do is cut down, because it sounds like you're smoking too much in a single session. Just take one hoot, wait a couple minutes, see how you feel after that and repeat as necessary. Getting too high isn't very fun; personally, I find the light buzz effect much more enjoyable.