Went scuba diving got bad rash and very sick what is this?

It sounds like you may have experienced decompression sickness, also known as "the bends." Decompression sickness is a condition that can occur when a scuba diver ascends too quickly from a deep dive, causing nitrogen bubbles to form in the body's tissues. Symptoms can range from mild skin rashes and fatigue to more severe neurological problems such as paralysis and seizures.

If you think you may have decompression sickness, it's important to seek medical attention immediately. Treatment typically involves recompression therapy, which involves breathing pure oxygen in a pressurized chamber to help reduce the size of the nitrogen bubbles and alleviate symptoms.

Here are some tips to help prevent decompression sickness:

* Ascend slowly from deep dives, following the recommended ascent rates provided in your dive training.

* Make safety stops at specific depths during your ascent to allow nitrogen to slowly dissipate from your body.

* Avoid diving multiple times in a day without allowing enough surface time in between dives.

* Stay hydrated by drinking plenty of water before, during, and after your dives.

* Avoid alcohol and caffeine before and after diving, as they can dehydrate you and increase the risk of decompression sickness.

* If you have any underlying medical conditions, consult with a doctor before diving to make sure it's safe for you.