If by doing the valsavar maneuver,while i have blocked ears from cold & midle ear infection, good or bad for me? will it cause more problems or helps?

Valsalva: Equalizing pressure with the Valsalva is fine, as long as you do it gently and don't force it. If you cannot achieve a pressure release, then stop because strong force could cause problems for your ear, if there was a sudden release-ruptured eardrum or discontinuity of the little ear bones called ossicles. Using decongestants and nasal steroid sprays can help aid eustachian tube problems.