Ive been having this problem that usually occurs after I smoke or drink caffeine. It will start with a pressure/numbness in my stomach that eventually goes into my hands and face. If I get up and walk around it goes away, but If i stay sitting it will get so bad that my hands especially my thumbs will lock up, and the muscles under my eyes will start to spasm. I also feel like i dont get enough air when this happens even though it feel like i am breathing normally.