Losing a friend is never easy, especially one who you saw so regularly, and with whom you had forged a strong bond. Keeping your own sense of calm and maintaining your friend’s memory are an important part of the grieving process. You are understandably angry because of the pain your friend’s death has caused, therefore, particularly sensitive to your husband’s comments, which merely reinforce your sorrow. I doubt he means to deliberately upset you, but may be thinking that as you dedicated much of your time to this lady, you now deserve some enjoyment from her kind gesture.
Make your husband aware of your feelings - that you are not ready to make extravagant plans yet, as you are still coming to terms with the loss of your friend. Hopefully he will understand that you would appreciate his patience at this upsetting time.
Nevertheless, it sounds like you need cheering up. Plan a day out and indulge yourself with some of the money your friend left you. Perhaps treat yourself to an item you would never normally purchase. Choose an exquisite piece of jewellery which could become a keepsake, to remind you of your friend each time you wear it. She had probably taken her own worthy causes into consideration, and had intended you to personally benefit from her bequest, so enjoy it. Maybe spoil your close friends and family to a meal or a theatre trip, and spend some quality time with those you love, which will create a feel good factor, and please do remember, this is what your friend would have wanted for you.
Then, put off making any further decisions regarding this inheritance until you are in a more focused state of mind, when hopefully you and your husband can then look forward to having a rational conversation about this matter. Finally - do consider, yes, it is your inheritance, but if you decide to make any decisions without your husband, this may cause serious problems within your marriage, which I feel would be the last thing your friend would have wanted when she wrote her will.