Well, it has been over 3 months since I posted this, and I thought I probably should give, to whoever is interested, an update.
My yellow orchid had definitely cold damage as it wouldn't keep the water when watering her, so I did it every 2 weeks and just a tiny bit to keep her at least a bit moist. At the beginning of April I had to repot her and cut the rotten roots that all of a sudden had appeared despite barely having been watered. Around a week later it opened all its buds and only 1 or 2 weeks later it started dropping the flowers. Ever since then she's kept 11 of them that are still hanging, small but looking nice. Now, the best surprise is that it's growin a leaf, two roots are growing now and another one is showing up! The old leaves are still looking a bit fragile, but at least I know she's still alive and going for it!
About the other two I had to sanitise them in the end, as the spikes started to wilt again and had to cut them at the bottom completely. Now, one of them is in between but I'm not sure she'll make it. Had no roots left, only one leaf is still lasting and I have it hanging on a pot with gravel and water (the orchid is not touching the water) and in my bedroom to see if the shade there helps a bit...
However, the other one, has given me the surprise of starting growing a new leaf plus the old one that stopped growing, and also a new root! I am sure there must be something going on under the soil, but until she's not strong enough, I won't have a look as it might be too much stress for her. Afterwards I guess I'll have to repot her properly so she can grow stronger!
The last picture is of the oldest one, and the other three of the yellow one that suffered cold damage.