Don't grieve alone; 14,000 members and growing
I'm sorry for your loss. Yes, it is normal after the devastation of a loved one's death to feel so depressed that you don't want to talk to anyone -- but you can also get help with those feelings, if you choose. There are therapists and grief support groups that many people find helpful; you might want to look for one or both of those in your area (you can usually at least start your search online).
You're very welcome. Have you found that seeing a therapist has helped you? I hope it has. I don't know about any specific grief support groups. as I don't attend them myself, but I have seen posts about them by other people (I don't remember if they were here or on other sites, probably both). Your therapist could probably recommend some such groups to you; alternatively, if you attend church/synagogue/temple, your religious advisor might be able to provide information about such groups as well.