I feel terrible guilt. I need your opinion and advice.
What do you feel guilty about?
I'm feel really sorry that I saw that picture.
It's good for you to get help and support to overcome the negative emotions you've experienced from seeing a disturbing picture. If the feelings of guilt are overwhelming, it would be a good idea to speak with a therapist as friends and family will not have the skills and training to help with significant mental health issues.
It's not just guilt. I still think about that picture and I feel aroused.
We can't always control how our body responds to events. If you're feeling strong, disturbing emotions over something you've witnessed, then you should get support; getting support is the one thing you shouldn't feel guilty about.