Just some thoughts, but mostly support for you here ...
I don't have a diagnosed anxiety disorder, but it runs in the family and I definitely tend to get stressed about things. We've had a lot of breastfeeding problems with my DD and it has made me what I would call anxious at times. (I had them with problems with BFing my son, too, but this time there have been a wider spectrum of issues.) I sometimes feel anxious when its time to feed her about something related to breastfeeding. (Usually, do I have enough milk for her and is she going to be hungry still? But in the morning I have too much, is she going to get too much foremilk?) I know this all might sound a little silly.
I'm still waiting for BFing to become truly an enjoyable experience and something that I am not worried about and my DD is now 3 1/2 months old. I do think that if you didn't have any problems before and you have had a rough time this time that its understandable that you are feeling some anxiety. For me, being my DD's food source is can feel like a lot of pressure when I have had supply problems and problems in the past with her being able to transfer milk from me.
I have been lucky to have a GREAT LC that has been so supportive and helped me through a lot, brainstorm and come up with solutions. Do you think it would be helpful to seek a professional opinion from an IBCLC to see if the tongue tie is still a factor? In the midst of the worst of all of this, I told me doctor about all the BFing problems we'd been having and asked my doctor if she thought I had PPD. She thought I had more situational depression, due to the extent of the BFing problems we'd been having and that any mom would feel this way, but to monitor how I feel after things get more resolved. We are still wrapping up some issues, so we'll see ... Things are improving, though.
If I were you, I think I would seek some professional help from someone that can help you with the lactation side of it and see if it makes you feel any better.