Self Massage the back of neck. https://www.youtube.com/watch?v=eA9hCrSc7iY Chiropractic adjustment will help. Take frequent Breaks at work. Core Strengthening Exercises. Use cervical pillow. Use Back Support.

No doubt It is post covid symptom. Consult online or offline with Physiotherapist for Proper assessment and exercise.

Yes its a post covid pain, keep your feet in warm.water twice a day, take Ultracet or myospaz forte if pain is severe. visit physiotherapy clinic for proper assessment of pain and exercises will be suggested.

Start supplement and strength exercise

Proper assessment necessary

In my opinion it could be bcoz of post COVID muscle weakness.It seems like plantar fasciitis.You can try treatment ie don’t overexert like avoid prolonged standing or walking,apply ice pack for 3-4 mins 3-4 times a day especially in the morning before leaving bed,apply anti inflammatory gel on your heel side cover half foot lower side as all trigger points are present there,while sleeping place a cushion or pillow below ankle and last wear comfortable footwear,no heels and buy a plantar fasciitis insole and wear it throughout day while standing inside your footwear ,buy the one that just covers your heels they are silicone base available on Amazon.Hope this should help you,try it for 5-7 days ,if not much difference show it to a physiotherapist near you so that they can provide some advance therapy depending upon condition. Thanks

Hard to say if it is only covid. But that could be a big factor. May be a reasonable thing to start some gentle stretching and exercises.