My spouse has been taking Metformin for decades without noticeable side effects. Apparently some people do experience digestive symptoms but often those go away after the initial adjustment period. The worst possible side effect is lactic acidosis, which is rare but more likely if you have kidney or liver problems or "conditions affecting oxygenation," which IMHO could include COVID-19 or possibly excessive aerobic exercise.
Did your cardiologist tell you WHAT the side effects of Jardiance are? Might want to investigate, they appear to include proneness to certain kinds of infections:
Jardiance: Uses, Dosage, Side Effects & Warnings - Drugs.com
The doctor should have told you about that because it means you should pay careful attention to hygiene "down there" while on this drug.
Also be aware that the older you are, the more likely it is that a UTI could result in "delirium" as a symptom, which can open a whole can of worms, especially if you end up in the hospital:
Urinary tract infection (UTI) is common in older adults, mainly due to several age-related risk factors. Symptoms of UTI are atypical in the elderly population, like hypotension, tachycardia, urinary incontinence, poor appetite, drowsiness, frequent ...
pmc.ncbi.nlm.nih.gov
Here's a comparison of Jardiance and Metformin at Drugs.com:
Compare Jardiance vs Metformin head-to-head with other drugs for uses, ratings, cost, side effects and interactions.
www.drugs.com
And another one at a different website:
Here are the key differences and similarities between Jardiance and Metformin. Both are considered Type 2 diabetes treatment but work very differently.
www.planetdrugsdirect.com
Jardiance does appear to have benefits for other health conditions than T2D, more so probably than Metformin.