Hey methodz... my personal opinion and being a football player my self... the streching exercises are fine....my opinion is that before doing strengthing exercises you should always do isometric exercises for shoulder stability and once the shoulder is stable then go into strenth exercises ( concentric, excentric).....I think maybe you are pushing your self too hard ..if the pain is too much you should try and go slower... and to me seeing a physio once a week is not enough if your trying to get on the field soon.
hope this helps