Capsaicin topical may be used up to 4 times daily or as directed on the medicine label. To apply a capsaicin topical skin patch, remove the liner and apply the patch to your skin over the area of pain. Press the edges firmly into place. Remove the patch and apply a new patch 1 or 2 times daily if needed.
Concrete retaining wall prices start around $30 per square foot including materials and installation and can go as high as $45 to $50 per square foot depending on how much prep work is involved in building the forms. Walls higher than four feet typically require a different type of form which will raise the cost.
But, you're not going to build that wall for ~$20 per linear foot, and even a fairly small lot needs a lot of fence or block... If your lot is 100 feet by 50 feet, that might be three-hundred feet of something... 6 foot wall runs about $20-$25 per linear foot installed. So figure on $2500~ish with hauling away the old fence.