How Much Potassium Can Be Increased By 15mg Lisinopril?

Hi. I am a pharmacist and when I recently had labs done my my potassium was 3.1! When my Physician put me on K-dur 20MEQ QD for a week and re-drew blood my Potassium was spot on 4.5 and I never felt better. She then had me come in a week later, off RX K+ and re-drew my blood and found I had a barely therapeutic 3.7 K+ level. I expected her to put me on K-Dur at some level but since I am on all of 15 MG lisinopril she keeps saying that it will raise my potassium too high (keep in mind max daily dose of lisinopril is 80MG/24 hrs.) However, since I am not going to change my diet to any substantial degree she says that I should take an OTC Pot. supplement (= low bid, non-standardized and unpredictable release) without following me up with labs. After taking OTC K+ for 2 weeks, I started having chest pains for a whole day with few intervals between them. When I discontinued the OTC Potasssium, the chest pains were gone the next day. I know that Hyperkalemia can cause chest pains just as hypokalemia can. Precisely how much might my potassium be raised by a mere 15MG lisinopril per 24 hours? My doctor is young and seems very much in fear of my being hyperkalemic but I ve never been so, just the opposite. The scenario seems absurd. What is a ballpark figure for how many mm Hg BP increase might correspond with 15MG lisinopril QD? Thanks.