Thanks for your question on Healthcare Magic.
I can understand your concern.
In my opinion, we should first rule out heart diseases.
Your symptoms like easy
tiredness, fatigue on minimal exertion, chest and
back pain etc are more suggestive of heart diseases.
So
consult doctor and get done blood pressure monitoring, ecg, 2d echo and
stress test (trade mill test).
If all these are normal then no need to worry for heart diseases.
Sometimes simple
musculoskeletal pain can be the cause.
So avoid movements causing pain. Avoid bad postures in sleep.
Take simple painkiller like ibuprofen.
Apply warm water pad on affected areas.
Don't worry, you will be alright with all these in 1 week but first rule out heart diseases.
Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks.