Hello Jo,
So sorry to hear about the loss of your partner. Those with family around them often find themselves trying to support them, rather than focusing on their own feelings, so I am not surprised to hear that this is only just hitting you now. There are so many other things you have to focus on in that first year too, so feelings tend to be neglected in favour of dealing with all the practicalities and official things, but they don't go away, they just build up inside until you have to deal with them, so maybe this is what is happening to you now.
Writing down how you feel and connecting with others who are sadly in the same boat is a good way to seek support however and you will find lots of that here. We are here for as long as you need us.
Sending you a big welcome hug..xx