I Feel Fine During The Day. But In The First

I feel fine during the day. But in the first hour of sleep, I am wakened by a spasm or jolt in my left side, just under my rib cage. Sometimes when it wakes me, I feel tingling and numbness. then after I get up and stay in an upright position or sit for an hour or so, I feel better. It is worse if I eat later or eat unhealthy, fatty foods.
I know that I have GERD or reflux, but it is the jolt & numbness that concern me. One night a couple of weeks ago I woke up from the spasm and thought I was having a heart attack. My wife took me to hospital where I went through several heart test and they said my heart is ok. I am scheduled for an EGD on Thursday. Have you ever heard of any symptoms like this before ?