I indeed addressed this in some former postings at the older forum many months back and without doubt, the position of the body can increase or decrease sensations and even the onset of palpitations.

This is merely due to anatomy and the force of gravity. Most patients seem to experience more palpitations when lying on the left side than the right and more patients report that they can feel them as more forceful in this position as well. The heart and the stomach are situtated just a bit more left of midline and if trapped air in the stomach or intestines is present, this can produce mild pressure against the diaphragm.

Sitting at a computer or other task for extended periods can cause musculoskeletal complaints, eye strain, repetitive task injuries, etc. and treatment is largely associated with cessation from the offending cause for a while. If you're suggesting that it may have culminated into the onset of your palpitations somehow, I'd have to claim otherwise. Most benign palpitations being experienced by persons on this forum are the direct consequence of anxiety disorder or changes in hormonal characteristics associated with menopause.

The fact that your palpitations are greatly reduced in frequency when your husband is on holiday is a very key factor in their origin and you should place far more emphasis on why that is the case rather than any worries about the consequences of palpitations themselves. As I've stated many times, the palpitations, while frightening, will never cause your heart to be damaged in any way and will never result in a harmful cardiac event of any type.

"Getting the palpitations out of your head" is the road to success and there are professionals available who are very good at illuminating ways for you to develop alternative thinking strategies and habits.

Best regards and Good Health