First of all, please do not get concerned with the possibility of having a Pancoast tumor
As you had undergone 5 X rays & all of them reveal normal findings.
The symptoms as mentioned in your post can be attributed to:
1. Neuropathy or nerve compression- as suspected by your doctor.
2. Dietary deficiency of certain nutrients like Iron, Vit B6, Vit B12, Folic acid
, etc. which help in blood formation and nerve conduction.
3.Systemic causes like diabetes
4. Hypocalcemia- decrease in calcium levels in the body
5. Metabolic & Hormonal causes
Though symptomatic relief can be obtained by administration of nervigenic agents like Vit B6, Vit B12, etc., the underlying cause needs to be treated.
So, kindly consult a Neurologist
& get a proper clinical examination done, including nerve conduction studies.
Investigations like complete blood count
, estimation of blood pressure & blood sugar levels will be helpful to rule out any pathological cause for the symptoms.
There is no need to worry, you will be fine.