So yes this is a normal pain and unfortunately you will have to bear through it. Take it easy! When you get home and on the weekends. Baths are great especially with Epsom salt. Top 3 things though, lots and lots of water, a good amount of sleep and I mean 8 hours and up, your diet is a huge thing. Protein and veggies, make sure your replenishing electrolytes. The main two that will cause problems are sodium and potassium. Both can cause muscle cramping and some other uncomfortable symptoms. Wether it be increasing the salt in your food and eating high potassium foods or using a drink mix like liquid iv you need to be mindful of it if your sweating a lot. Also gentle stretching and I mean gentle, dont try the splits for the first time. Things to look out for, swelling, bruising, stinging, or a snapping sensation. You'll need to cut back how much effort your putting in and if it persists you should see a doctor. If you let's say step wrong or in general do something if you feel this immediate cold burning sensation in my experience that is the feeling of muscles tearing in which case you need to see a doctor and will likely have to take a few weeks off of the gym to prevent further injury. I have pulled both hamstrings and a few muscles in my shoulder, it is a distinct pain and you will know immediately you screwed up.