It's interesting how it affects everyone in different ways and I'm glad you are able to sleep, but sorry you are feeling tired (which is how I feel when I get anxious too as it's so exhausting!).
I felt very on edge for the first week and found it difficult but managed to get through it by taking one day at a time and I also downloaded an app called Calm which I tried etc do for 10 mins a day.
Therapy - I had about 5 sessions with an anxiety specialist and he helped me with some ways of coping with anxiety. It was more breathing and bodily techniques rather than talking therapy. It did help. I also read a book called DARE (can't remember author but it was for anxiety) and that helped.
I have had talking therapy before - general counselling and also an 8 week CBT course which I did find helpful. It depends on your therapist and what works for you. I did try two different therapists last year and both didn't suit me at all. So at the moment I'm not but I'd really like to be (can't afford it just now and still on NHS waiting list!).
Never done online before and CBT works for some but not everyone. It just depends on what your issues are I guess! I had OCD thoughts and that was my main issue last year and sertraline helped loads.
But previously have had depression and not really anxiety so the things that helped that were some talking therapy with therapists who I felt really got me, and also exercise (walking, yoga, sometimes the gym or a Zumba class!), writing lists of things to do to keep me motivated, cutting down on alcohol and sugar, telling people, journalling, cutting out things or friends that really stressed me out.
Hope that helps. Is it mainly anxiety you're dealing with? For me anxiety went hand in hand with depression as the anxiety made me feel depressed as I thought it would never go, but it really has started to fade. I still get anxious, but in a more balanced and irregular way. I can deal with it more.
Though I'm learning to drive and that's sending my heart-rate through the roof!!