forearm and biceps injury

I seem to have injured my left forearm and biceps playing golf. I do not routinely play golf and I recall ‘straining it” during a swing. The injury persists since august. Sometimes in my forearm and other times in the biceps. I have moderate pain upon exertion and it appears to be weak. A elbow brace some times helps but is inconsistent. While I can do pushups it hurts to lift my four year old grand daughter.