If it significantly lowers your heart rate and blood pressure, as it was originally designed to do, stomach distress will be the least of your concerns.
I could not in good faith recommend this drug to anyone for any clinical indication unless they were in hospital with a hypertensive crisis and being monitored very closely.
It has also extremely limited efficacy for vasomotor symptoms (which include palpitations) and is no longer recommended by most specialists who treat menopause because the risks are simply not justified.
If you do decide to take it, I would recommend checking your blood pressure beforehand to make sure it is not already on the low side. I would exercise additional caution if you are already on any drug to lower blood pressure.
I would start with the lowest dose and then cut that into quarters, and please make sure you don't take it when you are going to be alone for the first 12 hours or so.