You actually had some bad happenings in your life, so its normal that you feel troubled right now. (I dont mean with normal, that you shall not bother yourself, but to accept the sad feelings about it, maybe share them with someone you know.) Give yourself some time to get back on again, try focusing on some good things, as example your sons wedding, your potential grandkids that might come from that.
If you feel after an certain amount of time (maybe about 4 weeks) still totally down, then try it with professional help. (Self-help groups in your area, internet forums, ...)
Sorry for your loss.