Withdrawals?

For the past 2 days I've been feeling really sick and just not right. Lower back pains, nausea, headaches and a few other things. It's been 4 days since I last took my pills and I could just be suffering from withdrawals. It isn't because I'm trying to go cold turkey, but because I have not remembered to take them. Started back up, hopefully I can feel better. Wish me luck?