I'm just wondering if anyone has intermittent tachycardia? I've been dx with MS now for three years and just last year my heart started beating fast, skipping beats, hard thumping that I can feel up in my throat and neck. Sometimes I feel like my head is being cut off from oxygen or blood. I've had a 2D Echo cardiogram, nuc med stress test and a carotid doppler and everything seems to be normal except for a few leaky valves which the cardiologist said isn't a big deal and not the cause of the problem. Turns out this is something not to worry about unless you're passing out from it. It is just driving me nuts! I'll have it for weeks, then goes away for awhile...then comes back. When this is happening sleeping on my sides, especially my left side makes it worse. Does anyone else experience anything like this? If so, what do you do...or take for it???