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I would advice against stitching the wound yourself, for these reasons
1. Sewing needles mightn't be sterile, causing infection (making the problem considerably worse

)
2. Stitching is probably left to an expert
3. Because you're not feeling any pain it's very possible while stitching you cause more damage without actually realizing it
How much is it bleeding? A lot, like spurting a lot? If it's just bleeding, I wouldn't worry too much, just apply pressure to it but I don't think you'd like, bleed to death from that.
Also please note, I'm
not a medical professional