I finished 6 cycles of chemo and Avastin 6 weeks ago (stage 3C). I'm now having just Avastin. My Onc says I'm to have 18 cycles of Avastin every 3 weeks. I'm experiencing terrible stomach cramps, I feel like I'm going to explode together with headaches and achy joints. It's the cramps more than anything. Have any of you experienced these side-effects?