Hey Billimba *hugs*,
I think all worry is a problem - whether minute or significant. Worry is a fairly useless exercise in that it usually resolves nothing. That means we cause ourselves a lot of trouble and pain over something we actually can't fix. Most of the things we worry about either don't happen, or aren't as bad as we thought anyway.
You say you are afraid of failure so I am thinking you probably have some underlying problems with self worth. Not uncommon in our culture where almost everything is 'idealised', and if you don't fit into the mould (which most.. if not pretty well all do not anyway) then you are somehow flawed and 'defective'. I would guess you judge and condemn yourself unnecessarily and don't allow the normal room that most give to themselves. Remember that you, like all people, make mistakes. Allow yourself to do so - not only is it natural, but you'll feel more confident in the process of accepting the fact that you can mess up, and it's perfectly okay.
I think it's essential to 'de-stress' in the areas of life that you can. What do you enjoy doing? If it's going for long walks, horse riding or a nice glass of champagne and just a 'quiet' time make room for something like that every day. If your job is pressuring you, try to look for ways to resolve this (i.e. if you are asked to take on more responsibility, explain that your lifestyle can't allow for this anymore). Try to limit the amount of pressures and burdens you put on yourself.
Exercise and eating healthily is also a gem. No, not dieting and an obsession with weight loss (this will have a deleterious affect) but simple healthy eating (lot's of salads, vegetables and foods low in saturated fats, refined sugars) and a healthy level of exercise. Our bodies cope with stress a lot better when they are in fit and healthy condition (I believe the ideal body type/weight is different for every person, you can feel it when you are at your peak).
I also believe it's important to know where you stand spiritually. I'm not one to force my beliefs on people, but if you are interested in what I think about who we are (from a spiritual point of view). Feel free to PM
My thoughts are with you mate, hope you feel better soon.