You may want to switch to tea. Or you will want to look into things which can minimalize the effects such as stimulation of the peripheral nervous system and excessive stress hormone release (sometimes the way caffeine stimulates you is "with fear" instead of "with drive" like say, meth might, to use an analogy).
Tea is nice because with caffeine and theanine in the plant, it helps the body enter a higher level of stimulation but without the excessive stress and disproportionate effects on your blood pressure. You can buy theanine supplements, they might help you, or anything that lowers blood pressure and counteracts any effects of cardiotoxicity coffee may bring.
Also, the mechanism that caffeine works by can lead to certain parts of your brain becoming stimulated that you may not want. Like having your blood pressure go up, stress hormones be produced, and the like-- all these things can lead to residual exhaustion even long after that pot of coffee, and can start your brain doing stimulating behaviours without being provoked (even having high blood pressure later at night because you had coffee earlier in the day can mean racing thoughts when trying to fall asleep-- your cognitive functioning is being fluid and your heart is pumping faster/harder).
Keep track of your blood pressure if you're going to be using stimulants and working out; just something you should start doing if it's to become a regular things. Additionally and more importantly, have something to reduce your blood pressure and possibly lower levels of general stress.
The "workout supplement" phenibut works on GABA receptors a bit like alcohol or benzodiazepines, and this is just an example because phenibut isn't something you can (or at least definitely should not) take regularly, but it will pretty much do all of those things for you. If you want something you can have once a week to save for a particularly high energy or stressful workout, consider ordering some phenibut.
I've used it for years (about once a month) and it's great for lowering blood pressure, anxiety, and still remaining functional. Like pretty much any GABA agonist it's going to become intoxicating if you take a higher dose of it (might have tried it a few times WINK) but it's like a higher functioning, therapeutic feeling alcohol if you're to do that. If you're to take it, 500mg would be a recommended starting dose and take it about an hour before you expect your workout to end for the most optimal timing (it takes a few hours to kick in), or whenever your stomach is the most empty.
Caffeine is, in my opinion, a poor choice because I don't think stressing your heart out is a good idea unless you are carrying it along with anti-stress things in your system. It's not like what you're doing is cardiotoxic, but it's not optimal, and you're feeling that with the side effects.