"I went to a doctor at a walk in clinic and he claims its allergies and game me some samples of corticosteroids to shoot up my nose... (lol) didn't take them I think he's nuts."

As long as you think he's nuts you'll continue coughing.  I'm very surprised that he didn't order allergy tests for you.  That will determine what you are allergic to and you can then avoid it.  Because you've been coughing for three months it could easily be something that you added at that time such as a pet, or piece of clothing or bedding or even a friend who can have things you are allergic to.  Food allergies can do it too and the testing there is pretty intense.

There's a world of things that could have happened three months ago but aging is one for sure.  As you get older you can and do develop more and more allergies.