Forgiveness

How does one go about asking forgiveness? First I pray to God to forgive me and for others to forgive me when I have done something I am not proud that I did. I had a bad day yesterday and in the midst of it all I was so upset I did things I am not proud of. I acted in a way that I should not of and I cannot say anymore than I am sorry.
I am a very tender hearted person and I don't like to make people upset. I tend to be the person who wants to fix problems and try to take on more than I should. I want peace and love, but some days just don't work out that way.
I also know that until someone has gone through major health issues in their lives like I have with my cancer you can never quite be comfortable with anything again. Every little ache or pain or issue that might make you think of cancer will always be in the back of your mind. I am getting closer to August 4th when I go back for my second set of scans to see if everything is still normal since my surgery in November. I pray daily all will be good. One can never get that thought out of their mind.
I pushed myself this week and became very worn down and fatigued, I think that is what made me act the way I did this week. My shot that I get for my cancer also has a side affect that it can lower blood sugar if you are diabetic. I had my shot last Friday and it takes about a week for my blood sugar to stabilize. I am diabetic and have been since 2008. When my blood sugar is messed up I tend to get very emotional and I cry easily.
Since my surgery for cancer I have become more sympathetic towards others who have had the same. I can relate to their feelings. I wish there was a support group near for my type of cancer, carcinoid. So many emotions run through your mind and body.
So if I am having a bad day, please understand it is not you. What would make things better for me is to just talk to me and ask if there is something you can do for me. An ear to listen, a hug, or just a smile to say you understand.