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You'll be on your side in a bed and asked to bow your back, pushing your backbone out toward the doc. You'll get a couple of injections of local anesthetic, the most painful part of the procedure--feels like bee stings but only for a nanosecond.
You will be told to arch your back outward as much as possible and you'll have to breathe shallowly. You will feel some pressure and you might hear a "crunch" as the space is accessed. They will remove fluid for visual exam and for a few lab tests. They'll put a bandaid over the site and you will be able to get flat onto your back.
There is minimal pain at the tap site, but don't sit up for the next few hours or you are guaranteed to get one of the worst headaches of your life. It won't kill you but you'll wish it would.
Yes, I've had one. I've assisted with dozens of them.
Your symptoms are very serious. Examining your spinal fluid is the next step toward figuring out what is wrong with you. Some diseases can only be diagnosed or ruled out by tests on spinal fluid. After the test is done, they will have a much better idea of how to treat you. The test is vital at this point. Please have it done.
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