Hi,
Your chest pain can be due to ischaemic heart disease with a history of coronary artery blockage .Probably you should be regular in your follow up to your cardiologist .
Also back pain can be due to herniated disc especially since you are over weight .You need an X-ray /MRI of the lower back and further physiotherapy etc to help in pain management .
Ringing in ears is called as tinnitus in medical language and causes can range from ear infection, wax in ears , anxiety , depression, various drugs .
Check this link
http://en.wikipedia.org/wiki/Tinnitus
Again this needs a thorough ENT evaluation for appropriate management.
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