What Causes Headache, Sleepiness And Exhaustion After Taking Fluoxetine For Anxiety?

Hello my name is Shelly, I have severe OCD/Anxiety and I am taking Fluoxetine 40MG for about 3-5 months now and I was just wondering if its normal to feel lots of anxiety and fidgety on this medicine?, it go s away and then comes back again its like an off and on contiueing thing, it also gives me headaches and I feel very sleepy a lot so I feel like I have no energy besides the energy that s taken away from my anxiety. I also was hoping if there is a organic type natural herb that you know of that has no bad side effects that I can take in replacement of drugs?. I saw online something called Native Remedies the natural choice PureCalm Herbal remedy to relieve stress, anxiety ,if you know anything about that and if it truly works or what? Well Thank you, Hope to here back to you.