I can really relate to this - I bought in May when the market was just dipping but was so fed up of forever being out-bid last year that I made it pretty clear to the EA I'd up my bid if needed. So, a £275k asking price that I put in at my first offer, the EA asked me to up to £280k to get the house. After accepting the offer, the EA told me the next bid was £260k. GRR!! This extra £5k wiped out my repairs/reno fund so I'm now in a house I can barely afford to do up and all the niggles are coming to the fore (things like they had dogs so the carpet still smells 4 months on after pro cleaning etc - the only way is to replace). An identical house (we're talking 10 year old houses on a small close, so they're still identikit stage) went on the week I completed in May, and is still unsold at £260k.
The bathroom is the major pain for me - there's no shower, and I'm a shower person. I thought I'd be able to do a c. £1-2k fix but the configuration is bonkers and it's not really do-able in a way I'd then be happy with having sunk the money, so it's a re-do the whole thing job really. I'm giving it a year then going to see about additional borrowing.
The way I'm squaring it about the house price is, unless you have barely any mortgage left, it really doesn't matter. What matters is the equity you'll get when you move, which is always going to be simply the amount that you've paid into the house, and it doesn't matter how much is left. So if you bought a house at £300k, paid in £100k deposit, and paid off £50k of the mortgage, you'll be transporting £150k to your next property. And if prices continue to dip, you actually do well when you move - the % saved on your next house in value is more than the % dipped on yours (a £500k house less 10% is now £450 to you, while your £300k house is only £270k - so you've saved £20k at that point if your next one is your forever home - and again, if it's not, it doesn't matter).
It's the reno bits that are worrying to me, not the house price. But it is hard not to feel a bit galling about it.