I have started out on the same road. I was off for five and a half months with a broken pelvis, didn't walk for about two months, increased weight and lost alot of muscle. Base fitness is about riding, as fast as you want, as slow as you want, just riding. Speed, strength and power training should all be built on a base. So I think you need motivation first and foremost to get you out there. I need it too. I am commuting by bike at least twice per week, nine and a half miles round trip and a 2 mile hill. I had plans to get out at weekends and increase my distance by 6 miles (10km) each weekend but my motivation is not strong enough to get me out in the blustery weather this weekend. My last non commuting ride was two weeks ago and I did 60km. I am doing gym work as well though including about and hour fat burning on a bike and cross trainer. Back to motivation, what I need and perhaps what you need is a purpose for your rides. Go somewhere; visit a friend or a bike shop or some other place where you would be interested in going. Get a friend to tootle with you, someone who understand what you are feeling and will go slow enough for you, but just quick enough to encourage you. It will take your mind off the cycling and you will just do it. The weather probably isn't helping, not helping me anyway. It's still April though. Set some targets, mine is a 100km randonee on the May BH weekend, then 200km on the August BH at the latest.
I hope you can get something from the above ramblings. Good luck.