Life throws a lot of tough times at us, every person tries his level best to deal with them but there are times, we need some support to get back to our original state of being. Its like a building who protects its inhabitants with all the adversities and provides warmth, but requires maintainence and renovation. our mind functions in a similar manner, while it is always functioning and protecting us from the negative and dysfunctional thoughts, there are times our minds gets overworked and starts filtering out good things. All of the issues tht you mentioned can be resolved with systematic planned psychotherapy. You can consult a psychologist. Cognitive restructuring of thougths, guided relaxation exercises can be very effecrive and beneficial.