Hi there. I have got a PhD offer, but not fully funded. I attended another interview, but have not received reply for 3 weeks. I just felt I probably lost that. Do I? I am thinking to apply one more, but I feel so stressful with curent MRes work...

Did you call/email to ask about the outcome of the interview? I know it seems likely they'd have got in touch with you by now if they wanted to offer you the place, but it's worth asking (sometimes it just takes them a long time to get all the administration done!) and even if it's a 'no' it gives you the chance to ask for constructive feedback, which would be useful if you want to apply for another one.