@Mal37 so sorry to learn of your loss. I experienced a lot of loss in a short period of time and really spiraled out of control in numerous areas of my life ten years ago. Looking back I wish I'd done more to sort and make sense of how those loses were affecting me. I did do some of that, but I also engaged in activities to distract myself from those thoughts and feelings by dramatically increasing my holiday décor collections, which is huge now, and I'm now in the process of reducing it. Not fun.
It's good that you recognize that the loss of your friend is affecting your self care. Getting back on track with eating healthy foods that improve your glucose levels and monitoring glucose levels daily is the most important thing you can do. Regular physical activity will help improve circulation.
In addition to doing those two things, I take a number of nutritional supplements that are important for those of us with diabetes: B-complex, D3, magnesium citrate, 400 mg alpha lipoic acid, and 25 mg zinc citrate. For heart health I add take a teaspoon of cod liver oil (for vitamin A), K2 (MK-7), fish oil, and CoQ10. For my thyroid condition, I take 100 mcg selenium.
Zinc is a new addition to my supplement regimen. I found this 2012 meta analysis interesting, "Effects of zinc supplementation on diabetes mellitus: a systematic review and meta-analysis"...
http://dmsjournal.biomedcentral.com/articles/10.1186/1758-5996-4-13
There's a thread here where forum members post what they're taking for neuropathy and whether or not its working for them...
http://www.diabetes.co.uk/forum/threads/help-in-dealing-with-neuropathy.74653/
There's much you can do.
Again, I'm sorry for your loss. The sadness still comes and goes, but thankfully, for me, it has lessened in intensity and frequency over time...