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The swooshing sound that you hear in your right ear is known as Tinnitus
Straining causes dilatation of blood vessels, increasing the blood flow and hence tinnitus. This type of tinnitus is due to turbulent blood flow.
Since it occurs or changes when you strain, it may also be related to change in blood pressure and the calcification / plaques in the blood vessels of the neck and brain. Atherosclerosis
causing turbulent blood flow in the carotid arteries is only one of many causes of tinnitus.
Other cause such as cervical spondylosis
may be considered if there is accompanying dizziness
. Tinnitus may also be drug induced.
I do hope that you have found something helpful and I will be glad to answer any further query.