Grieving and uncertainty

I started this [Thread] (https://www.reddit.com/r/GriefSupport/comments/5sdcfy/grieving_the_eventual_loss_of_my_40_year_old_wife/?st=iyv52d8o&sh=0bb47bf0) over in the r/grieving subreddit yesterday. just for a recap, my wife had a stroke and has been in the hospital for the past 5 months. In twelve days we will have be married for a total of 13 years and together for 14. Our relationship was good, but we fought about the silly things like money and personal priorities. For the most part, we were a good match and several friends thought we were the perfect match. She has turned 40 since and I 39 years old, since she has been hospitalized. Even though she is alive, I have been in mourning since she went to the hospital. I never thought, for the life of me, that I would be in this position a widower at 39. Even though she hasn't passed away yet, I fell like I said goodbye the night of her stroke. I am having a hard time with being alone, always have. I have friends and family, but nothing really replaces what my wife brought to my life. It's not just the sex, but the constant companionship. She was my best friend. The loss of a loved one is not foreign to me, I lost my father when I was 17. He was 51 at the time and I always expected it would be me first, but I digress. When my father passed, the only thing that I could do was be the man of the house, swallow my grief, and take care of matters. Now, I am feeling the same way with my wife. I have 3 kids and although my mother moved in to help me with them, I am still quite busy with that. So, I have once again lowered my shoulder in the hopes to barrel through the barriers of life. Unfortunately, this has also lead me to look to the future sooner than most probably would be expecting.

I want so badly to have someone to talk to, someone willing to accept me and my faults, someone to cuddle with and possibly share my life with. I am scared of raising my daughter and sons alone. When that should be the last thing in my mind, I can't fight the fear of being alone. It's not about the sex, even though the wife and I were still quite active. I am still young, but let's face it, I am not getting any younger. I have a lot to offer, but scared about living the rest of my life alone. Even though I have my PROs, I have baggage that might make me undesirable for most. Are these normal concerns or am I blowing things out of proportion?