Hi, Welcome to Health care magic forum.
As you describe it could be the swelling in the lung tissue, or
pleura,etc. So it is causing the pain in the chest back,and swallowing difficulty.
As they say, it is not clear from where it is coming,and what it is.For that they may need to have a
biopsy for diagnosis.
It may be a lung tissue , or a pleura growth.Once diagnosis is established,the treatment is planned and proceed.
Take more of green leafy vegetables,pulses,sprouts,and protein rich foods to have blood,general health and resistance against infections.
Wishing for a quick and complete recovery. Thank you.