Reddit mentions of Nutribiotic Organic Rice Protein, Plain, 3 Pound

Define 'heavily processed.' There are protein powders that are JUST the isolated protein with no other ingredients. Nutribiotic sells an organic sprouted brown rice protein. They don't use hexane processing but rather they grind and soak the rice and add an enzyme that digests the carbohydrate portion of the rice and leaves the protein component behind. That is then dried and sold as protein powder. I also emailed the company and their rice comes mostly from Cambodia so it doesn't have the arsenic concerns that Southern US rice has.

This is one I've only just gotten so I'm not 100% sure about recommending it: http://www.amazon.com/gp/product/B0033T8CZK/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

There are cheaper options if you don't care about organic.

Unfortunately spirulina is even more expensive and most of it is from China. The only one I found that wasn't was this:
http://www.amazon.com/gp/product/B0039ITKRE/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
And it's a big investment if you've never tried it. (it tastes like concentrated seaweed)

I suspect you may not be eating enough or replenishing electrolytes, but here's a basic run down of what I eat throughout the week. High carb, plant based diet.

Short Run Day (Less than 10 miles):

• Breakfast - 30g Wheat Square Cereal, 30g of Uncle Sams Bran Cereal, 14g Walnuts, 13g Milled Flax, Banana, 20g Golden Raisins, 6oz Almond Milk
  
• Lunch - 300g Brown Rice, Mixed Frozen Veggies
  
• Dinner - Whole Wheat Spaghetti with No Sodium Added Diced Tomatoes and Garlic, Spinach or Kale Salad with Avocado and Nutritional Yeast
  
  Mid Run Day (10-18 miles):
  
  
• Same as above, but I'll add in a snack of fruit or a Clif bar. Skratch or Gatorade if needed.
  
  Long Run Day (18+ miles):
  
  
• Two days out from a long run and up until the night before, I eat similar foods, but up the portion sizes.
  
• The day before I'll cut back on leafy greens, fat and protein. Basically, anything that might make me feel bloated.
  
• I do my long runs in the morning, so I like to get up 3 hours prior to the run and get some food in and give it some time to digest. Usually a whole wheat bagel with peanut butter and banana. I'll also drink an 8oz glass of Green Machine and another 8-12oz of water.
  
• During the run, I'll consume a handful of gels and some water.
  
• Post run, I try to get 15-20g of protein in within the first 20-30 minutes. Pea Protein and Brown Rice Protein are good vegan friendly alternatives to the whey based products. If I'm feeling lazy, I'll mix it in with some Green Machine, otherwise, I'll grab some Kale, Frozen Pineapple, Spirulina and Water and blend it all together.
  
• If you're feeling a little crummy afterwards try drinking a little bit of Coke. It's not exactly a health food, but it's got carbs, sugar and calories.
  

Pea/Rice blend (7:3 ratio). Complete amino acid profile, just as effective for building muscle as whey protein. (video that convinced me to switch: https://www.youtube.com/watch?v=-adhxwP2Pdg) Eliminating the whey improves your carbon footprint, and after making the switch my body fat went way down.

Pea Protein I use: https://www.amazon.com/BulkSupplements-Pure-Protein-Powder-Kilogram/dp/B00RPMMFWM/

Brown rice brand I use: https://www.amazon.com/Nutribiotic-Organic-Protein-Plain-Pound/dp/B0033T8CZK/

For flavoring, you can add your own vanilla or cocoa powder. For sweetener, I use Lakanto Monk Fruit Sweetener.
https://www.amazon.com/Lakanto-Monkfruit-Sweetener-Natural-Substitute/dp/B00EUF5N1C/

Happy mixing. :)