I can't loosen up this stiff neck. Any suggestions?

I’m on day three and I’m going a bit mad.

The bulk of the pain seems to be mostly right under my neck in the very top of my back/shoulders. It hurts most to tip my head back, and leaning forward or looking down (doing dishes in the sink, for example) makes it worse pretty fast.

I’ve been living with a moist heat bag thingie on for the bulk of these three days, I’ve taken Aleve, multiple hot showers, and my boyfriend has tried to massage it. The first day he tried, the muscles hurt to the touch. It’s not so bad now, but it’s still very tender. It feels better with the moist heat on, but as soon as I pop it back in the microwave, everything tightens up again.

I can’t shake it… save going to the doctor, is there anything else I could try?