Every Morning I cough up jelly like thick sticky phlegm..sometimes It's clear jelly like, sometimes it's white or grey
This type of mucoid phlegm is typical of allergic bronchitis. Since you have gastritis symptoms ,GERD also could be a cause.
Next Steps
Get an X-ray done. See a pulmonologist first. you will need lifestyle changes and treatment for gerd along with treatment for allergy after evaluation