Last night my stomach started to feel weird & also feels like i have mucus stuck in my throat. i have some cramping too,i used the bathroom but same ?

Some possibilities: Without an actual examination, I cannot give specific medical advice on your particular health and Increasing secretions and increased gastrointestinal tract motility are run by the same switches. Drugs (including ones of abuse and alcohol), irriation by a virus, ones own hormones, can all increase activity of the vagus nerve and increase secretions and gut. OR post nasal drip can irritate the gut

Upset stomach: Having mucous in the throat which eventually makes its way down to the stomach can be very irritating to the lining of the stomach and even cause nausea. Have you tried Mucinex (guaifenesin) to thin out he mucous or an antihistamine medication like Zytrec or Allegra to help stop the formation of the excessive mucous? If not, this would be a good start. Sounds like you might have some cold allergy/symptoms