So i'll be receiving a heparin and lidocaine instillation next week and I'm concerned about possible side effects, should I be concerned?

Heparine? Lidocaine instillation i understand, but heparin? (this is an anticoagulant?) that can make any area surgically accessed to bleed.
Yes. Anytime you ask a question like this you already are concerned. Being more fully informed about risks and benefits of an upcoming procedure will alleviate the uncertainty you are feeling. The only way to feel secure is to speak directly and frankly with your md. Do it.