I had elements of my life like yours OP. I was diagnosed with inattentive ADHD aged 39.
I'm going to try and give advice I would have liked at 25.
You genuinely have time to find a relationship. And you have time to get on your feet. What you cannot do is try and do everything all at once. It is a series of steps broken down.
The three important buckets are finding something you love to do for work, working towards doing things you enjoy in your spare time, and getting enough physical exercise (would also put things like getting enough sleep into this bucket).
Re health, you might find it helpful to speak to a GP about the stress. You may find an anti depressant helps - citalopram is good for focus and motivation. You might also benefit from CBT - there are a lot of 'terrified, can't, overwhelmed, panic, struggle' words. This could be reframed. E.g. I can't do this YET. Switch it around...from I don't know how to...to..how might I...etc.
Make a meal plan. Put a timer on and do a 25 minute tidy up blitz. Do a dance to a song. Have a container for every piece of clutter. Start small, with a list of 3 things to do a day. Find enjoyable things to do- what did you love to do as a child? Go for a walk when you feel anxious.
Look into voluntary work. Also The King's Trust which is set up to help young people up to 30:
www.kingstrust.org.uk/
In terms of savings, as soon as you have a job, open a help to buy ISA and put aside £200 a month. With that you could buy aged 35.
And start a pension when you have a job too, make sure you put in £150 a month. With compound interest, this will give you freedom later on. You have something many don't have - the gift of time for savings to grow.
Stop reading about pregnancy atm, but more practically you could look into egg freezing - may be a viable option if you are under 30 and have good egg reserves.