Hi Buckley,
there is still time for improvement and so my advice is to be patient. a steroid injection may help but there are risks involved. if you have a partial tear of your biceps tendon the steroid could weaken the tissue further and then you could end up with a complete rupture. Your consultant may refer you for an Wikipedia reference-linkMRI but if this is on the NHS you will have a several month wait for this and so dont expect things to happen quickly. my advice to you is to keep going with the physio and see how things go. it is possible that you have impingement of either the biceps or the Wikipedia reference-linkrotator cuff and this may be why you arent getting better. it may be a postural problem or like the others have pointed out tight pectorals or tgiht posterior capsule might be the problem. the aggravating factor needs to be established. good luck

john