Hello i have been having a stiff pain in my back..in the soft tissue right before the shoulder blade and along with that headach & nausea help plz?

Muscle strain : Sounds like you have neck/upper back muscle strain. That can cause tension headaches and nausea from the headaches. Try to see if improving your posture helps. Keep back straight, shoulders open and vision at eye level. Avoid prolonged screen time on computer, tablets or smart phones. Check online for some gentle neck and back stretches as it is too long for me to type here.