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In all probability, there may not be anything to worry.
The veins won’t cause this fluttering sensation.
A clot has already been ruled out.Artery
could cause this sensation. . If so, it should be constant – unlikely to subside.
Hence, it is most likely to be muscle twitching (fasciculation
This happens normally in many people and there is no cause for concern.
Since you are taking HCT, have your electrolytes (especially potassium) checked.
Also a look at calcium, phosphorous and magnesium
may give a clue in some cases.
Wishing speedy recovery