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You have not said of any characteristics of the pain – pain from the heart is oppressing, in central chest (and left), worse on effort, may radiate to shoulders and arms, associated with sweating and so on. You have said one location – but not which location!
Your symptoms do not suggest CAD. However, it is better to have a Treadmill Exercise Electrocardiogram (TMT). If it is normal, nothing to do – except to repeat annually. If in doubt, further work up is done..
The body's balancing mechanism is in the inner ear
. An ENT (Ear Nose Throat) specialist is the one to see - especially in the presence of tinnitus
. They have special tests to confirm or exclude the contribution of the ear...
Weight is like bank account. The account grows when you withdraw less (Cut down unnecessary physical work) and you deposit more (eat more). If the weight is picking up, it only means – the exercise is not enough or the food is more. See a good dietician - you have to reduce the quantity of your food and change the quality too. You need regular exercise.
Wishing speedy recovery