It never hurts to mention something regarding your health. More than likely, they'll take your heart rate laying/sitting/standing to see if there's a difference of at least 30, and if it should be looked into more! Wish you luck with it all <3

My heart beat stays relatively high and raises quite easily from minor activity too I have fibromyalgia and my doctor thinks that may affect that he encouraged me to slowly increase my level activity to try and help with that and other symptoms

For sure worth bringing it up!! Many fibro patients have it. There’s also a test you can do by yourself (google poor man’s tilt test) that can help you feel more confident you have it!! My cardiologist did the laying-sitting-standing HR/BP comparison and that was enough for the POTS diagnosis