This was THE worst for me after my homebirth.

I too had a tear right by my urethra and the first time I peed after the birth was horrible. I stopped drinking liquids and held it for nearly 24 hours. I tried a peri bottle, I tried standing up in the shower, I tried modifying a toilet paper roll, I tried petroleum jelly... nothing worked.
Finally, by the third day I had to pee so bad that I had my DH fill up the bathtub. I got in, lightly held a washcloth over the tear and I peed little by little. Probably took a half hour to empty my bladder. I was in tears because it still hurt so bad. That was my ritual for the next week or so. By 7 days after the birth I was finally able to pee standing up in the shower with a peri bottle. Now at 2 weeks I can pee on the toilet! Hooray!
Also wanted to add, I noticed the real healing happened when I let myself air out completely. Lying on the bed with a chux pad underneath completely naked as much as possible. Sorry this is so long!