breathing and anxiety problems

For the past 7-8 years ive had breathing problems, and anxienty. I have had x rays of my lungs which show nothing. Most of the time i have low energy, i usually go to bed early cause im always so tired i basically have to. I find that vigourous exercise or activities make my heart beat rapidly and breathing heavy. To me it just seems like my lungs dont expand fully, like taking a deep breath is just making my lungs expand halfway. Anyways if this sounds like anything anyone has experienced or as any advice thanks