I experienced SP as a sleep disorder in my early 20's and thought I was dying. Never did I think to look at the internet and figure out what was occasionally happening to me until recently. Since then, I've been attempting WILD's (3 or so times a week for a month or so). Using WBTB, I have been able to successfully induce SP but with some alarming results. Only once did it lead to a LD of which I didn't have very much control and that lasted for only a short time.

Some of the alarming sensations have been:
An elevated heartbeat(probably over-excited)
Uncontrolable shaking different than vibrations (like I was freezing cold or in shock)
Extreme dizzyness (feeling like I would completely black-out)

I guess I just want to make sure I'm not doing my body any physical or mental harm.

p.s. My first WILD was the most pleasant and peaceful experience in my life and I want more. It was like "The Nexus" in Star Trek Generations (nerd). I am assuming that I am wanting it to happen so much that I am too tense or excited when attempting that it's hindering my ability to be successful.

Any suggestions?