Contact a local door installer and have them replace the weatherstripping all around. With worn weatherstripping a lot of air comes in around the rollers and at the center posts where the doors hook together (when closed). If you have a pet door installed you may be unaware that the center posts are not linking up. This is a huge gap of 1/2 to 1 inch for the wind to blow right through. Take out the pet door or find a way to close the gap where the sliding doors no longer meet.
If the major air infiltration is at the top then very likely the original installer did not keep the track straight and level -- usually this is caused by screws pulling the top track upward to the framing header. Shims should be used to correct this but cannot be done without removing trim and possibly requiring the top track be removed too. A door installer can tell you whether moving the track down or making it straight will stop the air infiltration. Weatherstripping will only seal if there is contact between the door and the top track sides -- at least as wide as the weatherstrip and completely including the weatherstrip in the contacting surfaces.
Testimonial: "Thanks but, it leaks at the top of the frame. Should I contact a door installer? Can a window company help??"
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