Re: The very definition of an omnishambles.
Interest rates are rising because of inflation, which is rising because of all the money printed for COVID, and because global energy prices are rising.
It's also rather curious that you have a mortgage of over £650k (the minimum you'd need to see a monthly rise of £750/month) and didn't negotiate a longer fixed rate that would protect you from the very clearly telegraphed and predictable rate rises.
But I would point out that the pound dipped then recovered, so not a crash, the buy-back of gilts was to protect pension funds that had been badly managed and left themselves exposed to market volatility, something that Truss could hardly control, that the Bank of England should have raised rates much higher much sooner because of the inflation, that there never was £65bn of buy-back of gilts (last I heard it was under £20bn, and they were in profit due to price rises) and pension funds weren't pushed to insolvency precisely because of that Bank of England intervention.
Then you wonder why I think the mass media aren't covering this fairly. They should have been helping you understand all of this.