Losing someone you love so suddenly and especially if it's the first loss in your life, forces you to deal with emotions you haven't dealt with before, yet it feels like as an adult you should be in control, responsible, strong and rational. It takes time to learn how to go about this new feelings, and create support system around yourself that works. It sounds to me like you are isolating yourself at the moment and feeling upset that others don't approach you, I've been doing a lot of that since I suddenly lost my partner in February. It's almost easier to get upset and hurt with things and people around you, because then you don't focus on the real reason for this massive heartache. It's perhaps in a way a coping mechanism, so don't be scared to feel this way.
A few years ago when I was struggling to break off from the relationship I wasn't happy in, I went to a therapist that changed my life. I didn't want to talk for hours with a psychologist as I felt that would lead nowhere, so I was looking for something different. His style is combining simple meditation techniques, you just sit on the sofa and he talks you through a little meditation session to help you calm down, and then you discuss the problem you are facing being in that calm state of mind. It does wonders. I email him recently asking to help, he now lives in the UK, but comes to the Netherlands every month. I thought I'll share a segment of what he responded to my feelings of helplessness, worthlessness, loss of confidence and the start of anxiety:
"The first and main things to know are you are not worthless and you are not helpless.
I know it really looks like that at the moment, but you're having trouble remembering these two things:
1. You have all the help you're ever going to need right inside you. Sure, others can be a lot of help, but when the rubber really hits the road, you can help yourself best.
2. All the self worth you're ever going to need is also inside you, right now. Again, it's covered over with feeling bad and ideas that you don't have it, but it's still there.
You're probably wondering what you need to do to access these things. Well, the strange thing is 'nothing special has to happen', these qualities are available now, but you're labouring under the impression that you need to look somewhere outside for them.
It's a very common behaviour, most of the world it looking for it's self worth outside, but it always comes from the inside."