Thanks for visiting HCM.
, fever, nausea, back pain
suggests some infectious process going on.
I think you must go for complete blood count
, chest x-ray posterio-anterior view, sputum (for routine microscopy, gram stainig, culture sensitivity, acid fast bacilli staining).
In the meantime start the empirical antibiotics prescribed by your GP, paracetamol
for fever, alongwith some antacids. Continue with your anti-asthma medication.
Once the reports come meet your GP to come to a definitive diagnosis and treatment.