Some AAS cause people to retain water, raise blood pressure, stimulate CNS, have a bad cough, and to have lowered cardio tolerance all depending on the individual. These are all things you would want to avoid when diving.
And at depth interesting things happen to your body. It has been a long time so I can't remember the details but there is some effect on the dilation of your blood vessels and lowering of your BP. Also, if you have high BP you can end up with excessive fluid in your lungs but once again I don't remember the details.There are definite physiologic changes at depth.
Medical incidents while diving can be very unforgiving so I'd be careful and make sure you are in tune with your body.
This is a good question for the "Medical Issues" forum.