Its been a week i have pain in upper middle backandnear my left arm pits.also feel very weak.walking shrt distance increase heart beat.is it a symptom

Unclear: Not enough information to make a diagnosis. Left shoulder blade pain is likely to be muscular or referred from the shoulder joint or thoracic spine. Walking should cause hr to increase - that's normal. Feeling weak can be a symptom of virtually anything from lack of sleep to serious illness. You need a thorough evaluation. Perhaps you should see your family doctor?