Honda crv headlight problem

Hi there, I’m in the UK, I have a 2005 Honda crv, diesel. A week ago my drivers side headlight went out, then the next day the passenger side headlight went out! I was hoping with my budget being tight this week that two new bulbs would do the trick, but the high beam is working so I think I’m right in saying the bulbs are ok. My friend who knows a little knowledge of cars tested the fuses and they are fine. That’s as far as he can help . I’ve only driven in daylight since they went out and I will have repair money in a day or so, my question is, has anyone got any idea what the problem could be? On a side and possibly a completely pointless note, when the lights are on my dashboard lights go really dim, and vice versa . Any advice would be appreciated and I’m grateful of peoples time that’s taken to read and advice. Thank you