I have been to a&e (accident and emergency center) back and lower stomach has been really painful

I have been to a&e and the walking center and I have no infection and my bloods have come back normal, for the past 4 days now all my back and lower stomach has been really painful I’ve completely lost my appetite the last couple of days I’m getting tingling in my arm now as well and a lot of pressure on my spine but no one can find the problem, what else could I do? Thank you

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