Left side pain and nausea

I have been so blessed so far during my almost 4 month post op.  For the past two weeks I have been getting pain on my left side on my backside, perhaps easier to say it feels like a side ache after exercising too hard/swimming that type of pain.  I cut back on lifting weights for a little while to see if anything changed, nothing has changed.  Can we call this growing pains?  or has anyone else experienced this and anything to be alarmed about.  Also feeling quite nauseated after eating.  Nothing has changed in my line up of foods, no drinking with foods, just asking to see what you all know.

And, one more question.  I love peanurt butter in my protein but I also know that peanut butter might not be one of the healthiest choices, if you use some other healthier choice of peanut butter/powder or syrup could you let me know what you use. 

It's Monday, let's all have a good week.

Try PB2. You can find it on amazon. Good luck!