Congrats on taking a monumental and positive step for yourself
Over the past six years or so of my "coming out" I learned to expect two things. Plenty of questions and "what if'ing" before and especially after. After also brings out all the fears and angst of "This is getting too real"
When I dropped the T-Bomb on my wife, her response was pretty much the same as yours. But add in a healthy dose of anger, betrayal, "should have seen it coming", etc.. You see, she knew from day 1 I had gender issues and even experimented with transitioning twice.
Try to keep an open mind and don't overwhelm yourself with what could be. If simply coming out makes you feel better, great. It totally sucks hiding a part of yourself from someone you love and life partner. Maybe just doing a little thing like shaving your beard (believe me, for a group member this was imposible), or legs will help for months or years. For decades I got by with my occasional cross-dressing and almost daily panty wearing.
There are no timetable, no rules, no have-to's to deal with your personal version of dysphoria. Finding a support group or a for real gender therapist may help. It totally amazed me and still does, being in a room filled with people whose lifes are similar to my own. For me, the group also was the conduit for a couple of angels to come into my life at a time I really needed help to keep myself together and alive
Six years later I still primarily present male, on HRT, still with my wife who is not totally thrilled over some of the changes, totally pleased over the personal growth and new openess and communication between us. It has not been a cakewalk as her feelings of betrayal still makes her think any day now I will dump her and run off with a group member or some guy
One day at a time