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Considering your age and the symptoms you've been having, it could be an early warning symptom of a heart problem or kidney dysfunction.it can also be due to peripheral vascular disease. The most common conditions are
Congestive heart failure
Acute and chronic glomerulonephritis
Valvular heart disease
The pain is most likely not due to side effects of antibiotics. At this stage I would like to recommend you for a thorough heart and kidney evaluation to rule out the most common causes for your symptoms. Considering your age, it even becomes more essential to perform these tests.
The tests which you will require to clench the diagnosis are :
- Complete blood count , Hb
- Chest x ray
- Renal function test , mainly serum urea creatinine
- Urine protein level
- USG abdomen to evaluate liver.
It is advisable to do these tests on yearly basis after the age of 50 to screen most of the disease at early stage.
Certain life style modification also helps in a big way, quit smoking( if you are a smoker), add more green leafy vegetables in your diet, maintain correct BMI, avoid stress, and do not physically exert yourself at this stage.
Consult a GP/ Cardiologist , after a thorough examination he might ask you to do the tests ive mentioned before which will help in diagnosing the problem .It is treatable, hence need not worry .these treatments coupled with lifestyle changes on your behalf can bring back your life on track without any limitations.
Hope this helps. Please feel free to ask if you need further help.