Trauma of riding horses?

I have a horse i got him 8 months ago and I used to just love horses and it was my dream. I then got chronic fatuige and it was so so exhausting to ride or do anything with him and I just felt horrible afterwards because of it. Now I am getting better and I don't feel like going out and doing stuff with him. I have heard that your body can get scared and just not want to do it anymore because you have had bad experiences with it in the past and you just dont want to go through it again. When i used to ride i didnt really want to because i knew how bad it made me feel. I haven't ridden since I was really sick. I don't know if this is the reason but I have a feeling it is because before I got really sick I used to love horses! I also went to the beach for a week and I missed him so much but now I'm back and don't feel like doing anything. I don't feel like doing as much with him when I am tierd but when I have enough energy I feel like giving him a wash or grooming him. Me and his favourite thing is to give him a swim.

Has this happened to anyone else? And how do you fix this or know that it is the reason I am feeling this way?