Default [Q] Galaxy S4 i9505 screen issues (touch and rotate)

I recently got a S4 from a friend. At that moment it did not have a front glass (made an order from Ebay).

Now the first problem I noticed was the rotation problems. When Auto Rotate is on everything goes reverse. Default camera app has everything rotate as well (at all times). Tried to recalibrating but that did no good.
Second problem is that when I use the phone the damn thing at some point goes crazy. Hardly recognizes my finger (draw a line and it will mostly consists of dots). Use my knuckle and I can use it properly.

Can anyone help me? I need to get this thing fixed ASAP

The drawing shows how drawing 4 lines seems like. The only real line is made with my knuckle
And the other is showing my camera rotation problem.
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