Cat presented multiple symptoms over the past 2 days

This is not a cat I have direct contact with, it’s a cat taken care of by a friend who lives in another country.

The cat is a stray they picked up, he’s about 1 year old from what she’s been told (she’s a guest at the house the cat stays in, so she wasn’t there when they adopted him). The owners generally don’t treat the cat well, so it’s taken a liking to her since she cares about him more. She told me they used to let him out, but he would often come back bloody, so they keep him inside now, especially due to the quarantine (she is currently in Paris). I think he recently escaped a few weeks ago, but they found him and got him back.

Over the past 2 days she noticed the following:

• The cat started walking with his hind legs apart. His gait is otherwise balanced.
• He has trouble defecating and urinating. She noticed he would try to urinate, but only drops would come out.
• He has lost weight.
• He eats 7 times a day (that is the number she gave me) which is far more than usual.
• She has found lots of small white balls where he sleeps. I’m fairly certain these are tapeworm eggs.
• He licks himself very frequently. This includes both his fur and body, as well as his genitals and anus.
• She noticed bugs on his fur, resembling ants. I showed her images of ticks on cat fur and she says the bugs were larger. I also showed her images of ticks and she said they don’t look like that, they’re black and insisted they resemble ants. She also said she only saw 2 of them and hasn’t seen them since.
• He has been constantly sleepy, but his sleep patterns don’t seem to have changed as far as she can tell. However, she also described him as more "active". When I asked her if he’s become more aggressive, she said no, just more active.
• He meows constantly.

He urinated on her mouse pad yesterday. I told her he’s probably stressed and she said he looks like it. He got a stare for that and stopped going near the mouse pad at all, whereas he used to sleep next to it on her desk.

The owner believed he’s in heat, hence the meowing. We had nothing to go on other than that, so I assumed it would be true, since it’s spring and he’s not neutered. He also wanted to go outside a lot. I told her he might spray, especially if he’s stressed and that’s what she thought the white balls were at first.

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I’m not a vet, but I think this cat has a serious tapeworm parasite infection and probably some urinary tract infection among other things. I can’t confirm anything more about the bugs she saw. When I asked if she could photograph them, she said it’s hard because he’s always moving.

Currently all vets are closed in the city. Is there anything she can do to help him? I’m afraid the cat’s life is in danger.