This may sound unpopular, but the problem is the anxiety itself, not your plethora of choices. Removing the nubmer of choices likely will not remove the apprehension you have towards them. There are two resolutions to this problem:
1) Perseverance
2) Medication
My recommendation is to seek out a mental health professional to provide you a medical solution, which is a treatment regiment and not necessarily pills. I would consider a pharmaceutical answer only as a last resort and if the condition is severe, as determined by your mental health professional.
That being said perseverance, resiliency, is perhaps the best treatment path if you free to make major life changes and your anxiety is not a crippling mental health disorder. I have encountered many people who have had, in my opinion, a rather boring and easy life thrust into a world of making decisions they are not prepared for. The resulting scenario is a variety of relatively minor mental health ailments, which is a coping disorder more than anything else.
This has been studied to death in the military, largely as a result of the military's higher than civilian average suicide rate. The primary reason suicides are higher in the military, and in law enforcement, is that there are default behaviors limit and deter suicidal ideation, such as fear of death. Many military members and law enforcement learn to overcome that fear and so are less restricted from suicide as a matter of behavior alone. Once those factors are taken off the table and suicides are examined purely from the statistical data correlation the largest demographic is young white males from suburban middle-class families. The demographic with the lowest suicide rate are black females from lower-income households of any age. The data suggests the primary differential factor is proximity and frequency of hardships prior to entering the military, as in learned coping mechanisms.
Coping mechanisms are skills that can still be learned as adults, but only if you are willing to accept that there is a current problem state and that some change is required. This is why there are stories of people going on extreme out of routine adventures, which result in something they might describe as a religious experience.
In my own experience, having done this a few times, I find that I have exchanged one set of anxieties for others I didn't realize were ever present. I am embarking on my 5th military deployment and my 8 or 9th multi-month family separation due to military. My marriage and bold with my kids are strong and being away is no longer a point of anxiety. We have simply figured out how to make it work well for us. I used to be anxious about learning professional skills and getting a better corporate job, but after having gone through that a few times and playing the corporate game I am confident in my capabilities don't really care to play this game. Now, I am anxious to be work as a corporate developer from the boredom, limited responsibilities, low stress, long periods of downtime, and so forth. I see the things my coworkers stress over and I remember being stressed about those things many years ago and the familiar uncertainty of work, but its just not a big deal. I suppose I should have been careful what I wished for.