Yeah! So glad to hear that all was well with the breast concern...
...and to put your mind at ease, dense breast tissue turns out to not be a risk for BC any longer. That is a concern of the past when screening was not as effective as it is today. The dense tissue itself doesn't raise risk...it was that women who had fibroids and developed (unrelated) tumors weren't properly dx'd because they *used* to be more difficult to find on the older x-ray films and mammos.
Now as far as the phlegm streaked with blood goes...it could be from the drier air as Karen mentioned...very common this time of year. You are likely breathing deeply with sleep and drying out your mucous membranes, and then it is expelled when you get up and cough. (think of a bloody nose that is draining into your throat as you sleep)
As Hibee said, the only way to know for sure it to ask your doctor, but I am really confident that you have nothing to worry about
Keep working on your HA goals. You are getting better at getting through these concerns...so have confidence that you can gain victory over these fears step by step.
"Courage is not the abscence of fear, it is feeling afraid and doing it anyway!"
"Worrying does not empty tomorrow of its troubles...it empties today of its strength."
Corrie Ten Boom
Panic Syndrome recovery due to CBT