Gally, do take things very gently. Although there are undoubtedly some things that do need to be dealt with fairly quickly, lots can wait until you feel ready. Although easy to say, try not to let anybody rush you into decisions. Also, although they may be well-meaning, try not to allow others to make decisions for you.
It is still so very early on for you and, as you have already found, things will catch you unawares. It is OK to embrace your feelings in whatever way feels best for you. Again, repeating other advice, do, do, do make sure that you look after yourself and eat and rest as much as you can. Grief is exhausting and it is OK to allow yourself to feel exhausted. It is also OK not to put up any kind of 'front'.
As has been said, one step at a time 