Just wanted to add my congrats for your weight loss and for posting to get support. You could try taking some magnesium for the pain in your arm. It helps muscles relax.
If you want to do a coffee smoothie, my favorite is with either vanilla (or occasionally chocolate) whey and frozen cherries or peaches. you can add a little cinnamon with the peaches. Then the usual flax oil and chia seeds. Flora-Key is also very good in it.