Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain salty taste in mouth along with continuous
post nasal drip and head cold can be all due to
Sinus infection or Sinusitis..
So for this taking Nexium will not relieve you and you need to consult an Otolaryngologist and get evaluated and PNS view x Ray of sinuses can help in diagnosis and treatment can be done accordingly...
If Sinusitis is ruled out, a course of antibiotics, anti inflammatory painkiller like Ibuprofen, saline
nasal irrigation, decongestants like Phenylephrine, decongestant nasal spray like
Xylometazoline, steam inhalation can help..
For stomach cramps and pain
consult a Gastroenterologist and get evaluated and an Endoscopy can help in diagnosis and treatment can be done accordingly.
As of now take antispasmodic painkillers like dicyclomine and Mephenemic acid combination by consulting a local doctor..
Hope this helps..
Regards..