I second the excersize suggestion! Horse riding is the best thing in the world for me! It has helped me more than any medication or therapy ever could! I’m finding that the more I ride the less frustrated/angry I get. The being outside in nature and having my less imput stimuli then you do in the urban world is very very helpful in actually calming me and giving me a contented feeling and lowering my irritation level as well.
As far as the impusive portion I think that is so ingrained into who I am that while riding does help (with horses you HAVE to think before you act/react for your own safety) it will always be automatic for me to be impulsive. The only time I’ve ever in my entire life been able to not be impulsive is recently when I took Ritalin for the first and only time. It was as if I had been somehow outfitted with a filter that allowed me to consider my thoughts and actions before speaking/acting. This was an amazing experience and while I always knew that I never wanted to be on meds I’m glad I tried it for that 4day period if only for the indesribable feeling of what it would be like to have a filter like most people do. The very interesting thing I noticed was that not only did it help regulate the output but most markedly the INPUT! I could be at work or in a busy restaurant with tons of people noises and sights around me and people requesting things of me and I didn’t get overwhelmed or shut down (go into dreamy tuned out mode) I was able to calmly filter in the input and easily decide whether to act on that/react or feel something from it (ie irritated) or not. It was interesting. Also I was able to have patience and seemed more aware of time. I suppose if you are open to taking meds if you talk to your Doctor maybe there is a brand you can try that helps more with this ‘filter’ as i call it? The one I was on was Ritalin if that helps 
I personally wont be ever taking meds but I will always remember that feeling of the filter and try to replicate it as best I can by talking myself through it.
Hopefully I’ve been of some help
Good luck to you and pls know you are far from alone in this! It is a struggle everyday! Please be kind to yourself though and realize that you are trying the best you can despite what people around you who just dont understand say.
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