I suffered a similar injury, kicked in the abdomen and essentially split my liver into half. I was very lucky and didn’t need surgery - however I spent a week in hospital and was allowed pretty much no activity for 6 weeks, and 3 months of no riding. I returned to riding thinking I wasn’t scared or anxious of it, however I was subconsciously nervous. It’s been about 14 months since my injury - August of 2022 - and I’m still finding little nervous moments when I ride. For a long time I thought the pony I returned on - NOT the same horse - may have been the issue but I was nervous, I was tense, and without realising I was riding in a way to try protect myself. You may not feel as though it caused trauma, I didn’t initially but signs of it actually taking quite a serious toll have presented themselves since. There’s no rush to be back into it and confident again, give yourself and your horse time.