Welcome to the forum. I don't have a  whole lot of time but I wanted to respond. First off- I think many if not all of us can understand teh level of fear and frustration you are experiencing. There is so much information out there it can be truly overwhelming.   I contemplated the antibitic therapy but it seemed so wrong to me knowing what I knkow about how damaging antibiotics could be. I really didn't consider much of the main stream treatments although I looked into them and went to the "best" urologist in Philadelphia. I just knew from the start that they didn't get it. I thought about trying all kinds of natural things and I did also go to acupuncture and Naet which cost me over 2000.. But this is  the place where all the loose ends get tied up for me. I knew when I came to this site that I had found my path because so much of what was said resonated with me. That being said- it is HARD! But really- IC is hard and once I accepted that- yes, I have this terrible illness- then I could get down to the business of getting well. I don't regret my decision for one minute.
 
I have a 2 yr old, 6 yr old and 9 yr old. It is tough to be a mom and struggle with daily pain. (((((((((hug)))))))))))
 
ps- I was also tested (negative)for Lichens scelrosis.

I'm sorry to hear you're in so much pain and confusion.  It sounds like you have a lot going on and it must be quite overwhelming, especially when you're feeling at a loss of what to do next.  From what you write, it sounds like your body needs to get back into balance.   This is something Dr. Brizman knows about and can help with, but it is not a quick fix.
 
I was first diagnosed with IC at 16.  Half a lifetime later, I've learned a bit about it (I think!)  First, I personally see no reason to do a cystoscopy.  Why put yourself through pain for a test to learn that you have something that western medicine knows little about how to treat or to hear that you don't have classic IC signs but you still have the symptoms?
 
Second:  I found that the philosophy of bringing one's body into balance made sense to me rather than treating the symptom of bladder/vaginal/pelvic pain.  It makes sense to me that this is a systemic imbalance.  I've held this point of view for some time, so when I found Dr. Brizman, it seemed like a natural fit for me. I've been in treatment  with her for a little over a year now, and it becomes clearer all the time to me that this is an overall body problem, not just a bladder problem. 
 
Third: Choosing treatment with Dr. Brizman provides really positive and supportive community of other patients who struggle with bladder/pelvic pain AND are getting better.  For years I read other IC sites that just felt so hopeless, and this is not the case with this treatment.  This is not to say I don't have doubts and fears, but I believe in the underlying philosophy and end goal, and feel supported in the process by people who are going through it or have been through it as well.  It makes it much less lonely! 
 
Forth: Even if the diet doesn't seem to make your symptoms better in the immediate, it may still help your bladder heal to eat whole foods that are easy on the digestive system and to not consume a lot of sugars.  Sometimes sugar can feel like it's soothing the bladder when it's actually feeding all the little nasties (yeast, bacteria, etc) in your system and then you'll feel worse later! 
 
Before working with Dr. Brizman, I worked with a naturopath, who was very helpful but not very knowledgable about IC.  Dr. Brizman knows so much, and it's a relief to find a Dr. who understands what's going on where others have shrugged their shoulders and wished me luck.
 
Just a little encouragement- I still have a ways to go to be fully healed, but my life is quite normal at this point and I am pain free much of the time now.  Good luck in deciding what course of action is right for you!