Thank you OPs!! I honestly thought cracking the back, and now I know that obviously a lot of people don't do it, making me realise it can be really bad for me.
I called 111 and they suggested going to a and e, which I did. They did a normal examination and saw that all bones were functioning fine, they then gave me 3 types of painkillers! Liquid morphine, diazapan as a tablet and voltaron as a suporsotive! This was not fun! Two hours later the pain starting occuring again.
They then did a blood test, CTG scan and an x ray.
X ray came back fine, CTG scan came back fine, but not the blood test! The blood clot came back high for me! I started crying as I thought that was it for me! I am going to die from getting my back cracked!
My white blood cells were coming up high too! And I'm not sure why but they prescribed antibiotics as apparently I have a chest infection! I am confused! I don't have a cold, or a cough, or a fever, literally none of these things. And Before leaving he told me that if I get some symptoms such as a sharp pain in legs and chest, to come back quickly to the hospital, basically the signs of a blood clot!
I have learnt my lesson, sit up straight, do back exercises so that I never have to crack my back again!