I saw your question and just wanted to give you some encouragement. You have recently had a baby and this can cause all sorts of whacky changes not to mention you are lifting a 6 month old so no wonder you are getting sore. If you are anxious or tensed any muscle work will hurt more. Does a warm bath help your aches and pains? Are you sleeping and eating ok? It's just that some, if not all, of your symptoms point to an anxiety issue. I know, I've been there.
I also found breastfeeding was hurting my upper back badly until I found the solution was looking straight ahead rather than gazing down at my son.
Anyway, I hope you are feeling calm and enjoying your lovely family. Trust your doctors and if you feel you are not coping well tell them as there might be other solutions.
Take care.
You deserve a big bear hug! Just checked you out and you have your hands full. Trust in the Lord, Hon and try not to worry. You'll be ok and I'll be thinking of you, Judy Lewis