Thanks for query,
As you have gas problem
for long time and you have passed some rubbery pieces in the stool.
You might have some warm infestation.
And you have constant allergic rhinitis
,this may be due to warms.
Go for stool test
for ova and cyst of the warms.likely that you might have Tap warm.
mean while repot come you take some anti histamine
ok and bye.