I completely sympathize with you. I have had the thumping/whoosh sound for years with no relief. It comes and goes, sometimes several times a day or night. I try very hard to ignore it which isn't an easy thing to do. No doctor has been able to offer any way to relieve it and I've heard many different theories about the cause. My theory: no one knows why it happens. Mine does not coincide with my heart beat, I thought it did but aft careful testing, it clearly does not.
If you ever find a solution please come to this board and I will do the same. In the meantime I am wishing you relief.