My arms between shoulder and elbow has been aching lately and I put it down to carrying my 10 week old baby in her car seat. During the night last night I woke up with pain! There's pain when rested but agony to move. And with a 4 year old and baby, I need to move it. What does everyone think it is? Ive not been exercising my arm or anything. I can't even drive with it.