Feeling bloated, pain in lower back to the left side. gallbladder removed. have a pacemaker as well. heart problems. heavy breathing. fainting spells. what should i do?

Beyond the scope : You have many issues that need to be addressed and that's beyond the scope of this venue. You need a complete evaluation with targeted testing as indicated to hone in on what's going on. At a minimum, with a pacemaker and fainting spells, you need an immediate pacemaker check to prove it's working. Please start by seeing your family doctor or establishing with one if you haven't already. Good luck

Heavy breathing...: With a pacemaker in place; heavy breathing and Fainting spells require one sees their PCP and Cardiologist soonest or consider ER visit if no early appointment available

Urgent attention: Please seek urgent medical attention, It could be related to your pacemaker and/or your heart. Pain and bloating may or may not be related but needs to physically examined and get some labs and tests.