I only just noticed the date on the first post on this thread, so of course it must be all sorted ages ago. I do hope so anyway. I was led to the post by looking at the 'new posts' bit and this was highlighted by that really weird and creepy little nugget above. But I'll leave this info on here anyway. You never know, it might be useful. (edited to add this line after posting)
How long has she been on the tramadol? It can cause extreme nausea. The nausea in itself can lead to hypos, obviously.
The amount of Lantus she is on seems extremely high, so if she is not having any short acting insulin at present, I would suggest she cut down the Lantus also.
I know what tramadol can do and it isn't nice, and that is the understatement of the century. You can't keep anything down, not even sips of water. The nausea could, of course, be something else, but I would seriously suggest stopping the tramadol in case that is the cause. If the nausea goes away, you will know that was the cause. Has no health professional suggested such a thing? It is a common and well known side effect of Tramadol and usually is warned about when it is prescribed. Unless her pain is unbearable, then other painkillers should work. Tramadol is a very efficient pain killer, but it's not worth the vomiting if you are affected by it. Try that first and see if things settle down, and also look at her insulin/carbs ratios and try to work out an approach to her diabetes that incorporates that instead of a flat rate dose that takes no account of variations in carbohydrate intake. There is loads of information about how to do it somewhere on here, I'm not sure where, but there are plenty of people who can tell you.
Most important of all, cut down that insulin. Better that the blood sugars are a little high until it gets sorted, (That doesn't mean in the 20s!!) than hypo as you describe. To be that low, and for so long, is scary and extremely traumatic.
Do you know the actions of the drugs she is taking?
Gabapentum you know about,is a anti-convulsant and nerve pain medication. It would make sense that a seizure could have followed withdrawal.
Fluoxetine is the chemical name for Prozac, an anti-depressant which can have many and varied side effects. Including anxiety...
Diazepam is the chemical name for Valium: an anti-anxiety drug. Very effective, I do not know of any adverse side effects except the risk of addiction.
Cyclizene is an anti-hystamine and anti-nausea drug. Kind of logical in the circumstances.
It's a pretty potent concoction and I think you should find whichever duty doctor is available and talk it over with him/her. It is quite possible that the cyclizene is not dealing with the tramadol nausea.
Having said all that, I am NOT a doctor, but I do have experience with most of these medications, both personally and within my family. I am not saying that the nausea is caused by the Tramadol, simply that it is very, very likely and, subject to a doctor's approval, or at least, a doctor assuring you it would not be dangerous even if they don't want her to stop the drug, then get her off it and see what happens. Please do NOT do any of these things without talking to a doctor, because I could be so wrong. I do not have enough information or knowledge to make any medical decision, this is only my own experience.
I'm terrified of tramadol. Last time I took it, I had to get an ambulance out in the end (after about 24 hours) because I was so sick, going hypo and stupidly, had no Glucagon to deal with it without needing to swallow anything. I'll put up with a lot of pain, but not that kind of nausea.