First, don't consult Dr. Google. You'll go from an initial diagnosis to dead in three clicks! Second -- walk. Exercise is the only "treatment" for emphysema. Everything else is palliative. Third -- your diagnosis is NOT a death sentence. You can do all sorts of things to make life easier and certainly worth the living.
I take the happy pills for depression (something which seems to come with respiratory problems anyway) and they help. I'm sure that you have been advised to try to get out - even if only to a BreathEasy group... Company is good for your health!!
You will feel lousy after this diagnosis but we all live with emphysema or other respiratory conditions. You will get over the kick in the guts but maybe getting out of your bubble would help??